The Guardian's Campaign Diary will keep you up to date: "More and more questions emerge over the horrible story of the McCain campaign worker who says she was attacked in the street in Pittsburgh by a black man who carved the letter ’B’ on her face and told her: "You are going to be a Barack supporter." Police now plan to administer a lie-detector test over contradictions in her account. "If the incident turns out to be a hoax," writes a senior Fox News executive, "Senator McCain’s quest for the presidency is over, forever linked to race-baiting."

KDKA a little while ago: Police sources tell KDKA that a campaign worker has now confessed to making up a story that a mugger attacked her and cut the letter "B" in her face after seeing her McCain bumper sticker.

Via Warren Ellis