“Yes. Yes I feel that strongly about it. If we can get the necessary support and it comes to my desk I’ll sign it. That’s all I can do. I will sign it,” Cain responds.The President has nothing to do with constitutional amendments. They are passed by both houses of congress, and sent to the states. So he will not "sign" anything.
You'd think that a guy who has been running for President for months and considers himself a fan of the constitution might have some idea what the job of President is and is not -- at least more than some random guy on the internet.