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The comment came at the end of a half-hour question-and-answer session before about 400 of the biggest donors in GOP politics.
Walker wrapped up his answer by saying, “He’s said he is, and I take him at his word.”
Obama has repeatedly professed his Christian faith and attended Christian church services.
Back in February, The Washington Post asked Walker whether Obama is a Christian during the National Governors Association meeting.
“I don’t know,” he said then. “I’ve actually never talked about it or I haven’t read about that … I’ve never asked him that. … You’ve asked me to make statements about people that I haven’t had a conversation with about that.”
Democrats quickly seized on the comment, including former senior Obama adviser Dan Pfeiffer and top Democratic election lawyer Marc Elias.