Keith Olbermann is again being an embarrassment to MSNBC. The cable channel and MySpace have teamed up to choose two "citizen journalist" correspondents to cover the upcoming national political conventions. The "journalists" will be featured both on MySpace and MSNBC's campaign coverage. A spy said, "Every anchor is onboard and willing to play along, except Keith. He refuses to participate because MySpace is owned by Rupert Murdoch's News Corp." - which also owns Fox News and The Post.