I'm with Ambinder on this -- I think it's very strange of Barack Obama to be running a campaign against a shadowy "some" who have a lot of opinions that hard-core political junkies understand to be Hillary Clinton's, but that the voters to whom he's supposed to be appealing probably don't recognize. After all, in order to even understand that these lines are supposed to be attacks on Clinton you need to already realize that she has the characteristics Obama is trying to convince people she has.