What Bill Clinton allegedly said about Obama

One of the enduring mysteries of the 2008 campaign was what got Ted Kennedy so mad at Bill Clinton. The former president's entreaties, at some point, backfired, and the explanation has never quite emerged.
I've finally gotten my hands on a copy of Game Change, in which John Heliemann and Mark Halperin report:

[A]s Hillary bungled Caroline, Bill’s handling of Ted was even worse. The day after Iowa, he phoned Kennedy and pressed for an endorsement, making the case for his wife. But Bill then went on, belittling Obama in a manner that deeply offended Kennedy. Recounting the conversation later to a friend, Teddy fumed that Clinton had said, A few years ago, this guy would have been getting us coffee.

@'Politico'