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House and Senate control has flipped often in midterms since 1990
The analysis found the House changed hands five times in nine midterms since 1990, while the Senate flipped only three times.
Facts Data Team analysis of midterm elections since 1990 shows House control flipped five times, while Senate control shifted only three times in 1994, 2006, and 2014.
Unlike House representatives, senators serve six-year terms, so about one-third of the Senate is up for election every two years, whereas every House seat is up for election every two years.
Currently, Republicans hold 53 Senate seats and Democrats hold 45, while the House includes 218 Republicans and 214 Democrats, giving the Republican Party a slim majority.
More than 80 congressional members are leaving their seats, with competitive races in Maine, Texas, North Carolina, and Michigan as both parties vie for control.
Sometimes, a politician switching parties after elections can shift power; Sen James Jeffords switched to Independent, and Vice President Dick Cheney cast tie-breaking votes in similar situations.