Statistics concerning U.S. Senate voting include the fact that there have been 31 senators who have cast 10,000 votes each. Each of these senators was first elected in the second half of the 20th century.
Robert Byrd of West Virginia, the longest serving senator, cast 18,689 votes over his 51 years of service. William Proxmire from Wisconsin is the senator to have cast the most consecutive roll call votes, with 10,252 between 1966 and 1988. Between 2000 to 2014, there were 24 pieces of legislation that were voted on 15 or more times in a single day.
Between 1789 and 2014, there were 244 times when the Vice President was required to cast the tie-breaking vote. John Adams, the first Vice President, cast 29 of those votes.
The first Supreme Court nominee rejected by a vote of the full Senate was John Rutledge in 1795. The first Cabinet appointee the Senate voted to reject was Roger Taney as Secretary of the Treasury, in 1834, and the first treaty the Senate voted to reject was with Colombia over suppression of the African slave trade in 1825.
The first president to become a senator after leaving office was Andrew Johnson. Prior to becoming a senator, Johnson had been the first President to have impeachment proceedings brought by the Senate; however, the measure fell one vote short of the two-thirds majority required.