Madonna has encouraged her fans to support Barrack Obama by demanding they vote for ‘the black Muslim in the White House’.The Queen of Pop threw her weight behind the president during a concert in Washington, D.C. on Monday, before stripping off her shirt to reveal her massive ‘Obama’ temporary tattoo on her back.It is uncertain whether Madonna truly believes Obama, who is a practicing Christian, is a Muslim - or if she was simply poking fun at the numerous Americans who think he is.During the concert, she took a break to reflect on the state of the country, paying tribute to Abraham Lincoln and Martin Luther King, Jr.‘It is so incredible to think that we have an African-American in the White House,’ she said as the audience cheered. ‘Those fine human beings did not die for nothing.’ Daily Mail