Control of the Senate hangs in the balance with Republicans trouncing a number Democratic challengers in crucial states but still failing to lock down the seats needed to retain their tenuous majority.
One race in the state Georgia is headed to a January runoff. A second contest in Georgia and races in North Carolina and Alaska remain undecided, leaving the chamber now deadlocked 48-48. An outcome may not be known until the new year.
With the presidential race between President Donald Trump and Democrat Joe Biden also undecided, the Senate is in limbo because the vice- president of the eventual winner's party would serve as a tie-breaker in a split chamber.
"We're waiting — whether I'm going to be the majority leader or not," Republican Senate Majority Leader Mitch McConnell said the day after the election. That was still the case the following day.