Has Trump Driven Democrats Sane?

The Joe Biden polling surge has raised the frightful specter of Democratic rationality.

What if Donald Trump hasn't driven Democrats insane, sending them into a spiral of self-defeating radicalism, but instead made them shockingly pragmatic?

Biden's early strength suggests it may be the latter, that the reaction to Trump is so intense that it has crossed some sort of event horizon from fevered fantasy of his leaving office early via resignation or impeachment to a cold-eyed, win-at-any-cost practicality.

If this is true, one of the exogenous factors that could appreciably increase Trump's odds...