Two weeks ago I identified a possible tipping point for Barack Obama: Representative John Lewis's statement that he probably would vote for Obama as a superdelegate at the Democratic convention.

Now the civil rights hero has made it official by actually endorsing Obama.

Lewis has a lot of cred among House Democrats, among African American Democrats, among superdelegates. His move is an indicator that Clinton, who has a lead in committed superdelegates at this point, may not be able to count on that support. Lewis's announcement--even though it's not so newsy given his previous statement--is rather bad news for the Clinton camp.

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David Corn

Washington Bureau Chief

David Corn is Mother Jones' Washington bureau chief. For more of his stories, click here. He's also on Twitter and Facebook. RSS | Twitter