Republicans now control of The Senate and The US House of Representatives in a wave of Election Day wins which serve as a repudiation of President Barack Obama's second-term policies and put a series of Democratic states under control of new Republican governors.
Republicans won formerly Democratic Senate seats in seven states, including Arkansas, Montana, South Dakota, West Virginia, Iowa, Colorado and North Carolina.
Republicans scored a net gain of six seats to win the majority for the first time since 2006.
Barack Obama says the U Senate electoral map heavily favors Republicans, making it the toughest grouping of races faced by a second-term president since Republican Dwight Eisenhower lost heavily in 1958. Back then it was the Democrats, which took 13 Senate seats, including 10 from Republican incumbents, and won both Senate seats in the first-ever Senate election for Alaska.