A United States Representative is elected for a term of two years and is up for reelection during even years. This is different than a U.S. Senator, who is elected for a 6-year term and is reelected on a rotating schedule, so only one-third of the senators are up for reelection during any even year. There are 435 members in the House of Representatives and 100 members in the Senate.
The minimum qualifications U.S. Representative are that he or she must be at least 25 years old when seated, must have been a U.S. citizen for a minimum of 7 years and must live in the state in which the representative plans to be elected in. Potential senators must be at least 30 years old, a citizen for 9 years and live in the state. The number of representatives each state can elect depends on the state's population. For example, a smaller state such as Vermont could potentially have only one U.S. Representative, while larger states could have 10 or more. All states have two senators.
The head of the House of Representatives is called the Speaker of the House, and is chosen by members of the majority political party in the House. The Majority Leader leads the majority party with the Majority Whip as assistant. The minority party is lead by similar members known as the Minority Leader and Minority Whip.