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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.
The Senate. The U.S. Senate is considered the upper body of the U.S. Congress and is made of of two senators from each state. Senators are elected by popular election within their represented state and serve a term of 6 years. Elections for the Senate are held every 2 years, with about a third of the Senate being up for re-election each time.