In 35+ years of debate-watching, which, including primary debates probably includes more than 150 debates, I have seen scores of "gotcha" questions on abortion directed at conservatives. I have never once seen a tough abortion question asked of a "pro-choice" candidate.
Proposed question (which has never been asked):
"Mr. Obama, you have a long held view that late term abortion should be legal. Many say that a fetus or unborn child going through this procedure suffers tormenting pain undergoing a late-term abortion. Do you believe the researchers and doctors who assert this are wrong in their assessment, and if so, what specifically is that opinion based on?
Great point. The last “gotcha” question to a Democrat was Bernard Shaw’s query to Dukakis about what if his wife was raped. Dukakis blew the answer and many people thought he then blew the election.
Democrat journalists learned from that experience and never again have asked really tough, visceral questions of creepy, abortion-loving libs.