The argument doesn't seem to be catching on though. A new poll released Thursday shows Romney besting Obama among white evangelicals 68 percent to 19 percent.
"The survey signals that white evangelical Protestant voters are moving beyond the reservations they may have held earlier in the campaign about Romney's Mormon faith," said Robert Jones, CEO of the Public Religion Research Institute, which conducted the survey. "While two-thirds of white evangelical voters say that it is generally important that a presidential candidate share their religious beliefs, their differences with Romney on religion are not translating into a significant lack of support at the ballot box."
Obama led Romney among all those surveyed 47 percent to 38 percent, with 17 percent undecided.
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Rebekah Metzler is a political writer for U.S. News & World Report. You can contact her at email@example.com or follow her on Twitter.