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About one-third of the Senators in Congress are elected every two years. This means the 33 are up for election at any one time.
House seats are apportioned among each of the states by population. The 100 members of the Senate serve staggered six-year terms, with each state apportioned two senators, regardless of the state population. Approximately one-third of the Senate is elected every two years at a time. The rate for re-election for incumbents often exceeds 90%. The Congress, made up of the House of Representatives and the Senate, each has an equal say in the legislative process.