Without confirmation, the allegations were not widely reported by national media but still were damaging to Edwards. He was not being invited to speak at this month's, out of fear that the rumors could become a distraction at the carefully orchestrated gathering.
Barack Obama's campaign is preparing to announce the list of convention speakers in the coming days, and the fact that Edwards wasn't going to be included forced his hand. If he didn't tell the story first, it threatened to blow open as reporters explained why the party's last vice presidential nominee and third-place finisher in the primary was being snubbed.
Clearly the Obama camp was worried and wanted no part of John Edwards. There goes Edwards---under the bus.
It is a lot easier for Obama to keep stuffing people under the bus with properly inflated tires.