Was thinking about this while getting ready for work this morning.... And I fully expect the dems to try to pull a bait & switch in late September or early October.
I'm prognosticating that ol' creepy Uncle Joe Biden is going to drop out of the race right about the sept/oct break. His cognitive issues are going to continue to worsen until we see him step down, "for the good of the country and the party" and let someone else take the reigns. I'd be willing to bet that during one of the debates, he's going to vapor lock (whether real or fake) and there will be a lot of drama, a lot of concern for his condition, for about a week or so. At which point he's gonna step down from the nomination.
After much (apparent) scrambling by the DNC, someone who is polling well against Trump will (humbly of course) accept the party's nod and take on the "evil walking cheeto". For the good of the country, you know. I don't think it'll be HRC, too much baggage. Maybe it's Bernie, to re-energize all the Bernie Bro's and get out the free s*** army vote. Maybe a young female minority.
That's my guess at the DNC's master plan. Let's hear yours