When a McCain campaign representative told David Shuster today that the source of much of Barack Obama's fund-raising is unknown, the MSNBC host scoffed, claiming only "right-wing" blogs could believe that and challenging the spokesman to cite a credible source. 

Instead of fulminating about the conservative blogosphere, David might want to pick up a copy of Newsweek, which last time I looked had a news-sharing arrangement with . . . MSNBC.  None other than Newsweek's Michael Isikoff reported those very facts about Obama's fund-raising last week.

McCain spokesman Ben Porritt was Shuster's guest during MSNBC's 4 PM EDT hour today.

View video here.