He said he wouldn't if there was no chance he could win.

I love him but it's true.

He just completed a great West Coast swing through LA, Vegas, San Fan, and Austin, Texas. He also hit Chicago to rally with Rahm's opponent (who sadly lost). He got great turnout at each stop.

His website (yes, that's his website. Sorry people here who tried to prove me wrong) has some highlights from the trip: https://berniesanders.com/blog/highlights-bernies-western-swing/

I expect him to announce before the end of the month.

And there's nothing so "grass roots" as cold hard cash.

I totally understand your confidence in a HRC primary win.
I don't quite understand why brakes haven't been put on the undercurrent of taunting the left, even though that's SO EASY to do, with that much money to ensure a primary win. To my eyes, that doesn't scan as being a good campaign tactic. It scans as counterproductive, in fact. But obviously I don't see the voting demographic that the HRC campaign sees. "moderate Republican meets moderate Democratic"? Whatever.

My guess, worthless as a Canadian's guess could ever be, is that HRC will be routed by a "moderate Republican" candidate running to her left on quite simply everything except women's and LGBT rights, which will be downplayed because they really aren't HRC's strong points, her most visible points.