Democrats’ increasingly narrow path for winning back the Senate, explained

Democrats came into the 2020 Senate elections as slight favorites. But Republicans have had a strong showing.

Democrats entered Election Day with high hopes of retaking the Senate and winning full control of Washington if former Vice President Joe Biden beats President Donald Trump in the race for the presidency.

But by Wednesday, the election results made clear those hopes were dimming. If Biden prevails, it is looking likely that he will have to deal with a Republican Senate. That said, we won’t have a full picture until the final...