I think the dread over Trump being re-elected is part of the cycle of despair for those who oppose him. Hypothetical polls
Hypothetical polls are somewhat erratic, but they don't propose that it's a slam dunk for him. I'm hoping this cycle is something like:
1. They'll never nominate him.
2. We'll never elect him. Time for the first female prez!
3. OMG WTF OMG WTF
4. He's actually really, really bad, and his supporters will follow him off a cliff.
5. He committed multiple impeachable offenses and still stands.
6. He's invincible.
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7. Oh, hey, we have a candidate, and they're kicking up some dust and taking it to this guy. They're actually kind of exposing him. OK! Maybe, just maybe.
8. Everyone, regardless of who they supported in the primary, votes for the Democratic candidate. Young people actually vote. Some states with positive demographic changes (for Dems, anyway) start to switch. Arizona goes for the Democrat! (My own personal dream, that last one, but definitely in play.)
9. Ding! Dong! The witch is dead! (Trump seeks asylum in Russia)
10. Children at the border are reunited with their families, travel ban is lifted, some of the real ills created under Trump get rectified.
11. Now we can do some positive things! (Or at least get up on the bully pulpit and make a case for progress.)