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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.
United States Senate elections, 2016. Elections to the U.S. Senate were held on November 8, 2016. A total of 34 of the 100 seats were up for regular election. Those elected to the U.S. Senate in the 34 regular elections on November 8, 2016, began their six-year terms on January 3, 2017. Control of the Senate was up for grabs again in 2016.