DAVID HARSANYI: Democrats, get set to lose your ‘collusion’ delusions.

And the dream of impeachment? Well, that would probably die, as well.

Much of the case for the impeachment of Trump is tethered to the alleged illegitimacy of his election — and much of that case relies on the findings of the Mueller investigation. Judging from the reaction we’ve seen so far to the reports that Trump is merely a subject, but not a target, of the special counsel, it seems most Democrats haven’t fully prepared themselves for the eventuality that the investigation may end up vindicating Trump.

Circumstances can change, obviously, but what happens if election interference amounts to nothing more than Russian hacking, fake Facebook accounts and Twitter bots, all of which went largely ignored by the Obama administration until it became politically advantageous for Democrats to make an issue?

What will Democrats do if Michael Flynn, and others who misled investigators, did so for political and personal reasons having nothing to do with “collusion?”

If the durability of Bush Derangement Syndrome is anything to go by, I suspect not much would change.