The question drew boos from the audience and impassioned statements from the four candidates on the stage in Mesa, Arizona, last night.
"Since birth control is the latest hot topic, which candidate believes in birth control, and if not, why?" was the question posed via cnnpolitics.com.
It sparked a lengthy discourse by the candidates on religious freedom, contraception, and family structure. None of the White House hopefuls directly responded to the question.
Former House Speaker Newt Gingrich, who has taken on the media in previous debates, said it was legitimate to question "the power of the government to impose on religion activities which any religion opposes," before questioning CNN moderator John King and zeroing in on Democrat Barack Obama.