I voted for Bernie Sanders. I'd be perfectly satisfied to see Bernie Sanders as the Democratic nominee even though — and yes, I know the polls don't indicate this at the moment — I think Hillary Clinton would be the stronger candidate. I'd cheer if Bernie Sanders was the next President of the United States.
But come on. If he gets beaten out for the nomination as seems likely, it's going to be for one simple reason: Hillary got more votes. As Jonathan Chait notes, The Senator and some of his supporters seem to think that he should get it because, to them, it's obvious he deserves it more.
I still have a guy writing me who argues that Bernie should be the nominee because — look at these two photos I've sent you! — he had a bigger crowd at one of his rallies than Hillary had at one of hers. Even if the crowds were accurately measured and averaged, that is not a selection process that any modern, democratic nation has ever used to decide who wins an election. "Look at the crowds we're getting!" is something you say when you can't say "Look at the votes we're getting!"
I admire Senator Sanders but I will admire him a lot less if he starts fighting to overturn the vote or screaming he was robbed or doing anything less than throwing all his considerable weight behind the nominee.