Colin Powell asked a simple question that no one in US politics dared to ask, including Obama himself. He deliberately avoided asking it, and instead to state that he was a Christian, because he knew, like most Americans, that it was too risky when it came to Islam: anyone can run for president, Jewish, Mormon or Catholic but not a Muslim - and you shouldn't be linked to them. He also knew that most Americans have little idea about Islam, and that it was probably negative.
So Obama must be relieved that someone else has asked the question. Would anyone take a shot at answering it? Lets wait and see.