From Jonathan Bernstein:
The day after Alabama, Donald Trump is now the president in the most danger of losing renomination since Jimmy Carter in 1979.
He’s in this position despite campaigning against Roy Moore in the Republican primary, correctly saying that Moore would be a bad general election candidate. Then, the scandal that engulfed Moore after his nomination left Trump with no good choices. One can argue Trump made the decision that was best for his party and even his presidency.
But obviously none of it worked, and that fact alone will cause his party to start asking existential questions. How many Republicans in Congress and elsewhere are wondering this morning just how bad November 2018 is going to be? How many are asking the same question about November 2020? And is there anything they can do about it?