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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.
All class 3 Senators are up for election; class 3 was last up for election in 2010, when Republicans won a net gain of six seats. Currently, Democrats are expected to have 10 seats up for election, and Republicans are expected to have 24 seats up for election. Special elections may also be held to fill vacancies that occur during the 114th United States Congress.