A majority of Republican voters, 54 percent, think that President Obama is a Muslim, according to a new survey from the left-leaning Public Policy Polling (PPP).

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Asked whether they thought Obama is a Christian or Muslim or if they were unsure, 32 percent said they were unsure. Fourteen percent said he was a Christian.

Many right-leaning voters have been deeply skeptical about Obama's faith since before he became president.

The topic arose again prominently in 2012, when Obama faced former Massachusetts Gov. Mitt Romney, a devout Mormon, in the general election.

Obama rarely invokes his own faith in speeches and public appearances, though has remarked about his Christian faith during comments for holidays such as Easter.

The PPP survey obtained by MSNBC was conducted over the past week and has a margin of error of 4.1 points.