Townhall.com has the video of Cain's CNN appearance:
[I]f this answer doesn’t destroy him, nothing will. I get the sense watching it that he’s so unsure of how to answer this exceedingly easy question that he defaults to Netanyahu’s position on the assumption that prisoner swaps must always be the wise, statesmanlike, conservative thing to do. The alternative, that he knows what he’s talking about yet is still sincerely inclined to release the guy who planned 9/11 plus dozens upon dozens of other jihadi fanatics in exchange for one G.I., is even worse. I’d bet 95 percent of people asked on the street could answer this correctly, yet somehow our frontrunner not only blows it but feels obliged to hedge weakly by noting that he’d need all the facts to make a proper decision. Here’s a fact: Khaled Sheikh Mohammed blew up the World Trade Center. What other facts do you need?