President Barack Obama gave an unusually personal speech about his religious faith on Thursday, saying that "it is the biblical injunction to serve the least of these that keeps me going and keeps me from being overwhelmed," in address to a prayer breakfast in Washington.

The speech, delivered at the National Prayer Breakfast, comes on the heels of public opinion surveys that show only a minority of Americans know that Obama is a Christian and that a growing number believe he's a Muslim.

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