It was a rare glimpse into Clinton's unvarnished view of the Vermont senator, who continues to win states and raise tens of millions of dollars even as he remains hopelessly -- or close to hopelessly -- behind in the delegate chase.

Think of it from Clinton's perspective. She is nearly certain to be the nominee and would like to pivot to the general election -- message-wise and money-wise -- as soon as possible. But she also knows that she can't call for Sanders to leave the race since a) he keeps winning states and b) doing so would likely anger and potentially alienate the liberal bloc of voters that Sanders has and that Clinton needs for the general election.

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And so, she has to soldier on -- day after day, state after state. And it's not just that. She also has to deal daily with Sanders's insistence that he is the only true progressive in the race, the only candidate who puts principle before politics and genuinely believes what he says. Every day Clinton has to endure being cast as the candidate of Wall Street, of big money, of politics as usual. An example from Friday morning:

And, Clinton isn't able to do a whole heck of a lot about it -- and she probably shouldn't. As the race stands now, Clinton will be the nominee. Sanders is simply too far behind in the delegate chase to catch up. Why savage him and run the risk of losing some of his ardent supporters in the general election if Sanders simply has no plausible path to beating her?

Just because it may be the right thing to do politically doesn't mean it's easy or fun for Clinton, however. And, occasionally, her frustration with the current dynamic of the race peaks out. That's what happened on the rope line in New York on Thursday.