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While I know that many people like to point to tolerance of Jackson or Kennedy's convention push to demonstrate that intolerance of the same from Hillary is rooted in sexism, I'd attribute it elsewhere. The difference here is that she could conceivably win, something which would be viewed as a theft of the nomination by many (myself included). It's easy to tolerate, and be gracious towards, the campaign of someone who has no chance of winning the nomination - exhibit one is Ron Paul. When the person threatening to take it to the convention poses a realistic threat, you have to treat it like one.
That said, the announcement this evening that Hillary intended to suspend her campaign was a bittersweet one for me. Despite my many rants about her (just ask my wife), I think I've developed a strange fondness that I can't explain. We could certainly use more Democrats with the grit and tenacity she showed in this campaign. I wish her well.