Given the intensity of the emotions at play and the behavior of his supporters in Vegas, it's hard to see how it could have been anything but. Which is disappointing. A few days ago, Sanders' campaign seemed headed for an honorable legacy. But he has apparently decided instead upon a legacy of peevishness and sore losing, which is, as Frank Bruni noted a few weeks back in The New York Times, a hallmark of this political epoch.

Look: There is something to be said, under certain circumstances, for fighting to the last breath. Under certain circumstances, it is noble to stand one's ground, come what may. Under certain circumstances, it might even be heroic to soldier on past the point of defeat.

These are not those circumstances. Trump awaits. And every second the left spends arguing with itself is a gift to the presumptive Republican nominee.

Let's not get it twisted. For all that some people now seek to normalize him and his campaign, for all that they fool themselves into thinking he wouldn't be so bad, for all that a party once appalled to find him its leader now coalesces behind him, Trump is still what he's always been: a tire fire in an expensive suit.