Cook Partisan Voting Index

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The Cook Partisan Voting Index (CPVI), sometimes referred to as simply a Partisan Voting Index (PVI), is a measure of how strongly an American congressional district leans toward one political party compared to the nation as a whole. It was originally developed in 1997 by Charlie Cook of the Cook Political Report, a nonpartisan political newsletter, working with Polidata, a political statistics analysis firm.

The index for each congressional district is derived by averaging the presidential election results in that district from the prior two elections, then comparing them to how the nation voted as a whole. The index indicates the more successful political party and how many percentage points higher than the national average for that party. It is published as a Letter + Number combination.

Examples

A CPVI score of R+2 shows the Republicans received an average of 2 percentage points more votes than the national average. Likewise, a CPVI score of D+3 shows the Democrats received an average of 3 percentage points more votes than the national average.

List of PVIs by Congressional District

Alabama

1st--R+12
2nd--R+13
3rd--R+4
4th--R+16
5th--R+6
6th--R+25
7th--D+17

Alaska

At Large--R+14

Arizona

1st--R+2
2nd--R+9
3rd--R+6
4th--D+14
5th--R+4
6th--R+12
7th--D+10
8th--R+1

Arkansas

1st--D+1
2nd--R+0
3rd--R+11
4th--D+0

California

1st--In 2000 Gore received 56% of the vote, 8% higher than what he received nationwide. In 2004 Kerry received 60% of the vote, 12% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-01 a Cook PVI of D +10.

2nd--In 2000 Bush received 63% of the vote, 15% higher than what he received nationwide. In 2004 Bush received 62% of the vote, 11% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-02 a Cook PVI of R +13.

3rd--In 2000 Bush received 55% of the vote, 7% higher than what he received nationwide. In 2004 Bush received 58% of the vote, 7% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-03 a Cook PVI of R +7.

4th--In 2000 Bush received 60% of the vote, 12% higher than what he received nationwide. In 2004 Bush received 61% of the vote, 10% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-04 a Cook PVI of R +11.

5th--In 2000 Gore received 63% of the vote, 15% higher than what he received nationwide. In 2004 Kerry received 61% of the vote, 13% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-05 a Cook PVI of D +14.

6th--In 2000 Gore received 68% of the vote, 20% higher than what he received nationwide. In 2004 Kerry received 70% of the vote, 22% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-06 a Cook PVI of D +21.

7th--In 2000 Gore received 67% of the vote, 19% higher than what he received nationwide. In 2004 Kerry received 67% of the vote, 19% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-07 a Cook PVI of D +19.

8th--In 2000 Gore received 84% of the vote, 36% higher than what he received nationwide. In 2004 Kerry received 84% of the vote, 36% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-08 a Cook PVI of D +36.

9th--In 2000 Gore received 86% of the vote, 38% higher than what he received nationwide. In 2004 Kerry received 86% of the vote, 38% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-09 a Cook PVI of D +38.

10th--In 2000 Gore received 55% of the vote, 7% higher than what he received nationwide. In 2004 Kerry received 59% of the vote, 11% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-10 a Cook PVI of D +9.

11th--In 2000 Bush received 51% of the vote, 3% higher than what he received nationwide. In 2004 Bush received 54% of the vote, 3% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-11 a Cook PVI of R +3.

12th--In 2000 Gore received 68% of the vote, 20% higher than what he received nationwide. In 2004 Kerry received 72% of the vote, 24% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-12 a Cook PVI of D +22.

13th--In 2000 Gore received 69% of the vote, 21% higher than what he received nationwide. In 2004 Kerry received 71% of the vote, 23% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-13 a Cook PVI of D +22.

14th--In 2000 Gore received 64% of the vote, 16% higher than what he received nationwide. In 2004 Kerry received 68% of the vote, 20% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-14 a Cook PVI of D +18.

15th--In 2000 Gore received 61% of the vote, 13% higher than what he received nationwide. In 2004 Kerry received 63% of the vote, 15% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-15 a Cook PVI of D +14.

16th--In 2000 Gore received 65% of the vote, 17% higher than what he received nationwide. In 2004 Kerry received 63% of the vote, 15% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-16 a Cook PVI of D +16.

17th--In 2000 Gore received 64% of the vote, 16% higher than what he received nationwide. In 2004 Kerry received 66% of the vote, 18% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-17 a Cook PVI of D +17.

18th--In 2000 Gore received 53% of the vote, 5% higher than what he received nationwide. In 2004 Bush received 50% of the vote, 1% lower than what he received nationwide. The average of the differences between Gore's and Bush's percentages in the district and their percentages in the country overall give CA-18 a Cook PVI of D +3.

19th--In 2000 Bush received 58% of the vote, 10% higher than what he received nationwide. In 2004 Bush received 61% of the vote, 10% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-19 a Cook PVI of R +10.

20th--In 2000 Gore received 55% of the vote, 7% higher than what he received nationwide. In 2004 Kerry received 51% of the vote, 3% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-20 a Cook PVI of D +5.

21st--In 2000 Bush received 60% of the vote, 12% higher than what he received nationwide. In 2004 Bush received 65% of the vote, 14% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-21 a Cook PVI of R +13.

22nd--In 2000 Bush received 63% of the vote, 15% higher than what he received nationwide. In 2004 Bush received 68% of the vote, 17% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-22 a Cook PVI of R +16.

23rd--In 2000 Gore received 56% of the vote, 8% higher than what he received nationwide. In 2004 Kerry received 58% of the vote, 10% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-23 a Cook PVI of D +9.

24th--In 2000 Bush received 53% of the vote, 5% higher than what he received nationwide. In 2004 Bush received 56% of the vote, 5% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-24 a Cook PVI of R +5.

25th--In 2000 Bush received 54% of the vote, 6% higher than what he received nationwide. In 2004 Bush received 59% of the vote, 8% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-25 a Cook PVI of R +7.

26th--In 2000 Bush received 52% of the vote, 4% higher than what he received nationwide. In 2004 Bush received 55% of the vote, 4% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-26 a Cook PVI of R +4.

27th--In 2000 Gore received 63% of the vote, 15% higher than what he received nationwide. In 2004 Kerry received 59% of the vote, 11% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-27 a Cook PVI of D +13.

28th--In 2000 Gore received 75% of the vote, 27% higher than what he received nationwide. In 2004 Kerry received 71% of the vote, 23% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-28 a Cook PVI of D +25.

29th--In 2000 Gore received 59% of the vote, 11% higher than what he received nationwide. In 2004 Kerry received 61% of the vote, 13% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-29 a Cook PVI of D +12.

30th--In 2000 Gore received 70% of the vote, 22% higher than what he received nationwide. In 2004 Kerry received 66% of the vote, 18% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-30 a Cook PVI of D +20.

31st--In 2000 Gore received 79% of the vote, 31% higher than what he received nationwide. In 2004 Kerry received 77% of the vote, 29% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-31 a Cook PVI of D +30.

32nd--In 2000 Gore received 68% of the vote, 20% higher than what he received nationwide. In 2004 Kerry received 62% of the vote, 14% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-32 a Cook PVI of D +17.

33rd--In 2000 Gore received 85% of the vote, 37% higher than what he received nationwide. In 2004 Kerry received 83% of the vote, 35% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-33 a Cook PVI of D +36.

34th--In 2000 Gore received 73% of the vote, 25% higher than what he received nationwide. In 2004 Kerry received 69% of the vote, 21% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-34 a Cook PVI of D +23.

35th--In 2000 Gore received 83% of the vote, 35% higher than what he received nationwide. In 2004 Kerry received 79% of the vote, 31% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-35 a Cook PVI of D +33.

36th--In 2000 Gore received 59% of the vote, 11% higher than what he received nationwide. In 2004 Kerry received 59% of the vote, 11% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-36 a Cook PVI of D +11.

37th--In 2000 Gore received 76% of the vote, 28% higher than what he received nationwide. In 2004 Kerry received 74% of the vote, 26% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-37 a Cook PVI of D +27.

38th--In 2000 Gore received 71% of the vote, 23% higher than what he received nationwide. In 2004 Kerry received 65% of the vote, 17% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-38 a Cook PVI of D +20.

39th--In 2000 Gore received 63% of the vote, 15% higher than what he received nationwide. In 2004 Kerry received 59% of the vote, 11% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-39 a Cook PVI of D +13.

40th--In 2000 Bush received 55% of the vote, 7% higher than what he received nationwide. In 2004 Bush received 60% of the vote, 9% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-40 a Cook PVI of R +8.

41st--In 2000 Bush received 55% of the vote, 7% higher than what he received nationwide. In 2004 Bush received 62% of the vote, 11% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-41 a Cook PVI of R +9.

42nd--In 2000 Bush received 57% of the vote, 9% higher than what he received nationwide. In 2004 Bush received 62% of the vote, 11% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-42 a Cook PVI of R +10.

43rd--In 2000 Gore received 64% of the vote, 16% higher than what he received nationwide. In 2004 Kerry received 58% of the vote, 10% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-43 a Cook PVI of D +13.

44th--In 2000 Bush received 52% of the vote, 4% higher than what he received nationwide. In 2004 Bush received 59% of the vote, 8% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-44 a Cook PVI of R +6.

45th--In 2000 Bush received 49% of the vote, 1% higher than what he received nationwide. In 2004 Bush received 56% of the vote, 5% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-45 a Cook PVI of R +3.

46th--In 2000 Bush received 54% of the vote, 6% higher than what he received nationwide. In 2004 Bush received 57% of the vote, 6% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-46 a Cook PVI of R +6.

47th--In 2000 Gore received 57% of the vote, 9% higher than what he received nationwide. In 2004 Bush received 50% of the vote, 1% lower than what he received nationwide. The average of the differences between Gore's and Bush's percentages in the district and their percentages in the country overall give CA-47 a Cook PVI of D +5.

48th--In 2000 Bush received 57% of the vote, 9% higher than what he received nationwide. In 2004 Bush received 58% of the vote, 7% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-48 a Cook PVI of R +8.

49th--In 2000 Bush received 56% of the vote, 8% higher than what he received nationwide. In 2004 Bush received 63% of the vote, 12% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-49 a Cook PVI of R +10.

50th--In 2000 Bush received 54% of the vote, 6% higher than what he received nationwide. In 2004 Bush received 55% of the vote, 4% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-50 a Cook PVI of R +5.

51st--In 2000 Gore received 57% of the vote, 9% higher than what he received nationwide. In 2004 Kerry received 53% of the vote, 5% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-51 a Cook PVI of D +7.

52nd--In 2000 Bush received 56% of the vote, 8% higher than what he received nationwide. In 2004 Bush received 61% of the vote, 10% higher than what he received nationwide. The average of the differences between Bush's 2000 and 2004 percentages in the district and his percentages in the country overall give CA-52 a Cook PVI of R +9.

53rd--In 2000 Gore received 59% of the vote, 11% higher than what he received nationwide. In 2004 Kerry received 61% of the vote, 13% higher than what he received nationwide. The average of the differences between Gore's and Kerry's percentages in the district and their percentages in the country overall give CA-53 a Cook PVI of '''D +12.

Colorado

1st--D+18
2nd--D+8
3rd--R+6
4th--R+9
5th--R+16
6th--R+10
7th--D+2

Connecticut

1st--D+14
2nd--D+8
3rd--D+12
4th--D+5
5th--D+4

Delaware

At Large--D+7

Florida

1st--R+19
2nd--R+2
3rd--D+16
4th--R+16
5th--R+5
6th--R+8
7th--R+3
8th--R+3
9th--R+4
10th--D+1
11th--D+11
12th--R+5
13th--R+4
14th--R+10
15th--R+4
16th--R+2
17th--D+35
18th--R+4
19th--D+21
20th--D+18
21st--R+6
22nd--D+4
23rd--D+29
24th--R+3
25th--R+4

Georgia

1st--R+14
2nd--D+2
3rd--R+19
4th--D+22
5th--D+25
6th--R+19
7th--R+19
8th--R+8
9th--R+24
10th--R+14
11th--R+18
12th--D+2
13th--D+10

Hawaii

1st--D+7
2nd--D+10

Idaho

1st--R+19
2nd--R+19

Illinois

1st--D+35
2nd--D+35
3rd--D+10
4th--D+13
5th--D+18
6th--R+3
7th--D+35
8th--R+5
9th--D+20
10th--D+4
11th--R+1
12th--D+5
13th--R+5
14th--R+5
15th--R+6
16th--R+4
17th--D+5
18th--R+5
19th--R+8

Indiana

1st--D+8
2nd--R+4
3rd--R+16
4th--R+17
5th--R+20
6th--R+11
7th--D+9
8th--R+9
9th--R+7

Iowa

1st--D+5
2nd--D+7
3rd--D+1
4th--D+0
5th--R+8

Kansas

1st--R+20
2nd--R+7
3rd--R+4
4th--R+12

Kentucky

1st--R+10
2nd--R+13
3rd--D+2
4th--R+12
5th--R+8
6th--R+7

Louisiana

1st--R+18
2nd--D+28
3rd--R+5
4th--R+7
5th--R+10
6th--R+7
7th--R+7

Maine

1st--D+6
2nd--D+4

Maryland

1st--R+10
2nd--D+8
3rd--D+7
4th--D+30
5th--D+9
6th--R+13
7th--D+25
8th--D+20

Massachusetts

1st--D+15
2nd--D+11
3rd--D+11
4th--D+17
5th--D+9
6th--D+10
7th--D+18
8th--D+31
9th--D+15
10th--D+8

Michigan

1st--R+2
2nd--R+9
3rd--R+9
4th--R+3
5th--D+12
6th--R+2
7th--R+2
8th--R+2
9th--R+0
10th--R+4
11th--R+1
12th--D+13
13th--D+32
14th--D+33
15th--D+13

Minnesota

1st--R+1
2nd--R+3
3rd--R+1
4th--D+13
5th--D+21
6th--R+5
7th--R+6
8th--D+4

Mississippi

1st--R+10
2nd--D+10
3rd--R+13
4th--R+16

Missouri

1st--D+26
2nd--R+9
3rd--D+8
4th--R+11
5th--D+12
6th--R+5
7th--R+14
8th--R+11
9th--R+7

Montana

At Large--R+11

Nebraska

1st--R+11
2nd--R+9
3rd--R+24

Nevada

1st--D+9
2nd--R+8
3rd--D+1

New Hampshire

1st--R+0
2nd--D+3

New Jersey

1st--D+14
2nd--D+4
3rd--D+3
4th--R+1
5th--R+4
6th--D+12
7th--R+1
8th--D+12
9th--D+13
10th--D+34
11th--R+6
12th--D+8
13th--D+23

New Mexico

1st--D+2
2nd--R+6
3rd--D+6

New York

1st--D+3
2nd--D+7
3rd--D+2
4th--D+9
5th--D+18
6th--D+38
7th--D+28
8th--D+28
9th--D+14
10th--D+41
11th--D+40
12th--D+34
13th--D+1
14th--D+26
15th--D+43
16th--D+43
17th--D+21
18th--D+10
19th--R+1
20th--R+3
21st--D+9
22nd--D+6
23rd--R+0
24th--R+1
25th--D+3
26th--R+3
27th--D+7
28th--D+15
29th--R+5

North Carolina

1st--D+9
2nd--R+3
3rd--R+15
4th--D+6
5th--R+15
6th--R+17
7th--R+3
8th--R+3
9th--R+12
10th--R+15
11th--R+7
12th--D+11
13th--D+2

North Dakota

At Large--R+13

Ohio

1st--R+1
2nd--R+13
3rd--R+3
4th--R+14
5th--R+10
6th--D+0
7th--R+6
8th--R+12
9th--D+9
10th--D+6
11th--D+33
12th--R+1
13th--D+6
14th--R+2
15th--R+1
16th--R+4
17th--D+14
18th--R+6

Oklahoma

1st--R+13
2nd--R+5
3rd--R+18
4th--R+13
5th--R+12

Oregon

1st--D+6
2nd--R+11
3rd--D+18
4th--D+0
5th--D+1

Pennsylvania

1st--D+36
2nd--D+39
3rd--R+2
4th--R+3
5th--R+10
6th--D+2
7th--D+4
8th--D+3
9th--R+15
10th--R+8
11th--D+5
12th--D+5
13th--D+8
14th--D+22
15th--D+2
16th--R+11
17th--R+7
18th--R+2
19th--R+12

Rhode Island

1st--D+16
2nd--D+13

South Carolina

1st--R+10
2nd--R+9
3rd--R+14
4th--R+15
5th--R+6
6th--D+11

South Dakota

At Large--R+10

Tennessee

1st--R+14
2nd--R+11
3rd--R+8
4th--R+3
5th--D+6
6th--R+4
7th--R+12
8th--D+0
9th--D+18

Texas

1st--R+17
2nd--R+12
3rd--R+17
4th--R+17
5th--R+16
6th--R+15
7th--R+16
8th--R+20
9th--D+21
10th--R+13
11th--R+25
12th--R+14
13th--R+18
14th--R+14
15th--D+3
16th--D+9
17th--R+18
18th--D+23
19th--R+25
20th--D+8
21st--R+13
22nd--R+15
23rd--R+4
24th--R+15
25th--D+1
26th--R+12
27th--R+1
28th--R+1
29th--D+8
30th--D+26
31st--R+15
32nd--R+11

Utah

1st--R+26
2nd--R+17
3rd--R+22

Vermont

At Large--D+8

Virginia

1st--R+9
2nd--R+6
3rd--D+18
4th--R+5
5th--R+6
6th--R+11
7th--R+11
8th--D+14
9th--R+7
10th--R+5
11th--R+1

Washington

1st--D+7
2nd--D+3
3rd--D+0
4th--R+13
5th--R+7
6th--D+6
7th--D+30
8th--D+2
9th--D+6

West Virginia

1st--R+6
2nd--R+5
3rd--D+0

Wisconsin

1st--R+2
2nd--D+13
3rd--D+3
4th--D+20
5th--R+12
6th--R+5
7th--D+2
8th--D+0

Wyoming

At Large--R+19

References

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