If what many of us are working for comes to pass (and Nate Silver underestimates Trump yet again*), it'll be fun to retrace the journey, highlighting the milestones along the way.
Here is one such milestone. Trump is leading Hillary in RCP's general election polling average for the first time:
The lead is razor thin and well within the margin of error. But it's only May. Trump's numbers are all moving up. Meanwhile, Hillary has been bumping along horizontally and she has so many as-of-yet unexploited vulnerabilities that it's hard to see much of a way for her to ascend. Polls of "likely voters" are, other things equal, superior to those of "registered voters", and Trump's lead is largest in the only "likely voters" poll included in the average. Trump unofficially ended the Republican primaries substantially outperforming his polling numbers. Hillary can't keep pace (see Oregon, for example).
The Clintons are in trouble.
Parenthetically, picking Sanders as vice president would probably reset the general election match up to a month ago when Hillary averaged a 5-10 point lead. Besides the bad blood between Sanders and the Democrat party machine, this would of course mean a white-white Democrat ticket. I won't be alone in the schadenfreude I'll enjoy if we get to see that straining the precarious unity of the Coalition of the Fringes.
* Silver, who claims the biggest mistake he made in the Republican primary process was acting like a pundit and failing to create a quantitative model to support his predictions and here he is repeating the same allegedly flawed process for the general election. It wasn't the lack of a formalized model per se, though, that caused him to miss so spectacularly, it was his failure to look at the most relevant indicators that did.