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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.
In that cycle, many toss-up and red-state Democrats faced re-election for the first time since casting a ballots for Obamacare. Senate seats are up for election every six years, with approximately 1/3 of the seats up every two years.Safe Republican Seats Up for Re-election. The GOP should have 24 seats to defend out of the overall 34 seats up for election. Luckily, 18 of those seats will start in the likely Republican column.enate seats are up for election every six years, with approximately 1/3 of the seats up every two years. Safe Republican Seats Up for Re-election. The GOP should have 24 seats to defend out of the overall 34 seats up for election.