Rep. John Lewis, one of several longtime African-American political leaders who'd offered Hillary Clinton early endorsements, is switching sides and joining the Obama camp. Don't miss Noam Scheiber's TNR article on second-thoughts among pro-Clinton African-Americans more generally.

This kind of thing is probably a leading indicator of what I expect will be a looming collapse in her superdelegate lead if she doesn't start making a quick recovery in the ranks of pledged delegates (something I think she may well do, I don't really understand the atmosphere of writing her off that seems to be in the air in DC this week).

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