LOS ANGELES: Pop diva Madonna urged fans to vote for President Barack Obama in America's November election, but raised eyebrows by calling him a “black Muslim,” according to a video posted online Tuesday.

In the clip reportedly shot during a concert Monday night, she listed American icons Abraham Lincoln and Martin Luther King before turning to Obama, of whom she is a well-known supporter.

“And now it is so amazing and incredible to think we have an African American in the White House,” she said in an expletive-laden speech, flanked by her troupe of black dancers at the show in Washington DC.

“So y'all better vote for... Obama, okay?” she added, before saying: “For better or for worse, all right, we have a black Muslim in the White House."

“Am I with you, and are you with me?” Madonna — who at one point admitted to feeling “a little dizzy” and repeatedly sucked on a bottled drink and blinked a lot — asked rhetorically, to whoops from the audience.

Overall, 17 percent of 3,000 voters asked in June and July thought Obama was Muslim, despite the Christian church-goer's repeated affirmations of his faith.

Obama is fighting for re-election against Republican challenger Mitt Romney and the country votes in six weeks time, on November 6. Representatives for the singer did not immediately respond to requests for comment on her widely-reported remarks.