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The Rev. Franklin Graham, son of Billy Graham, isn't sure President Obama is a Christian. While he admitted on MSNBC's Morning Joe that "he has said he's a Christian, so I just assume that he is," Graham also wouldn't rule out the idea that the president is a Muslim. Islam has gotten a "free pass" under his leadership, Graham said, and the Muslim world sees him as a "son of Islam" because his father and grandfather practiced the religion. Graham also spoke on the Republican candidates' religions, confirming undoubtedly that Rick Santorum is a Christian, saying he thinks Newt Gingrich is Christian because he says he is, and noting that most Christians would not recognize Mitt Romney's Mormonism as part of their own faith but did not mention how he feels about it.