I heard the speech and Bush did not say Obama. He was referring to a group of people. Gees, they are so thin skinned. 
the line that biden is spinning on this one is, "I heard from people I trust, people in the media, that the bush people said on background that this was a reference to obama". he said that over and over on something I was watching; it may have been hardball.
first of all, background is just that, background. it is unattributed, and there is an understanding that it isn't to be used in the story, but to give the reporters a "feel" for the situation. but most egregiously, this is a triple hearsay. it's no better than idle gossip.
the faux outrage from the dems on this one ridiculous.