Senatorial elections are not held at the end of every six-year term. They are actually scattered over the six-year term so that not all Senators are up for re-election in the same year. How are Senatorial elections spread out?

U.S. Senators serve six-year terms, and their elections are staggered so that roughly one-third of the Senate is elected every two years. This divides the Senate into three groups whose terms end at different times. Therefore, the correct choice is “Approximately 1/3 of Senators are up for re-election every two years.”

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