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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.
A system with senators who serve one two-year term and two four-year terms every ten years is considered a 2-4-4 term system. 1  In the 12 states where the length of the term is two years, all state senate seats are up for re-election every two years. Arizona, Connecticut, Georgia, Idaho, Maine, Massachusetts, New Hampshire, New York, North Carolina, Rhode Island, South Dakota, Vermont.