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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.
U.S. Senators serve 6-year terms, and can serve unlimited number of terms. Senatorial elections are held every two years, with 33 or 34 seats up for election each two years, in a rotation. So if you start with 100 Senators, you have 33 up for reelection in 2018, 33 more in 2020, and 34 in 2022 (Iâm not sure which year actually has 34 seats up for grabs, but you get the gist, I hope).