Balance of power: With several races still undecided, Senate control remains at a deadlock By Catherine Park Control of the Senate was still up in the air Thursday as Republicans beat Democratic challengers in crucial states but failed to lock down the seats needed to retain their tenuous Senate majority. One race in 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.