Townhall.com has the video of Cain's CNN appearance:
BLITZER: Could you imagine if you were president … and there were one American soldier who had been held for years and the demand was al Qaeda or some other terrorist group, “You got to free everyone at Guantanamo Bay” -- several hundred prisoners at Guantanamo. Could you see yourself as president authorizing that kind of transfer?
CAIN: I could see myself authorizing that kind of transfer, but what I would do is I would make sure that I got all of the information. I got all of the input, considered all of the options. And then, the president has to be the president and make a judgment call. I can make that call if I had to.
[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?