https://fivethirtyeight.com/features/democrats-have-a-whac-a-mole-problem-in-the-senate/

«It’s too soon to say the Senate is a lost cause for Democrats. A 1-in-6 chance isn’t good, but it isn’t zero, either. The scenario for a Democratic victory, however, probably involves a systematic polling error in which all of the polls are off in the same direction rather than Democrats clawing their way to victory on a race-by-race basis. The map was tough enough for Democratsthat almost everything possible was going to have to go right for them to win the Senate, and it hasn’t.»

Come on, systematic polling error!