2016’s Other Big Question Mark: The Senate

There is a second critical contest in America’s 2016 elections: the battle for control of the Senate.

Republicans, pessimistic about their presidential prospects, feel an urgency to hold on to the Senate, where they now effectively have a 54-to-46 advantage. (Democrats would have to score a net gain of 30 seats to win a majority in the House, a highly unlikely prospect.) Both parties acknowledg