Republicans inched closer to a narrow House majority Wednesday, while control of the Senate hinged on a few tight races in a midterm election that defied expectations of sweeping conservative victories driven by frustration over inflation and President Joe Biden’s leadership.

Either party could secure a Senate majority with wins in both Nevada and Arizona — where the races were too early to call. But there was a strong possibility that, for the second time in two years, the Senate majority could come down to a runoff in Georgia next month, with Democratic Sen. Raphael Warnock and Herschel Walker failing to earn enough votes to win outright.