(FILES) US singer Madonna performs at the Charles Ehrmann stadium on August 21, 2012 in Nice southeastern France, as part of her MDNA world tour. Pop diva Madonna has urged fans to vote for Barack Obama in America’s November presidential election — but raised eyebrows by calling him a “black Muslim,” an online video showed on September 25, 2012. In the clip reportedly shot during a concert Monday night, she lists American icons Abraham Lincoln and Martin Luther King before turning to Obama, of whom she is a well known supporter. AFP PHOTO / VALERY HACHE / FILES