His campaign has completely mismanaged this yet again. He has shifted his position repeatedly on it even today. First he is adamantly denying any awareness of a settlement, then later admitting he did know of an "agreement." He comes off like a liar and/or a moron (my sense is he's both). It shocks me that the GOP's distaste for Mitt Romney is so strong that "Train Wreck" Cain continues to match or beat him in polling.
GOP, you have a real problem. The next President will either be the one you already hate (if you nominate Cain, Perry, Bachmann, Paul or any of the also-rans), or a different one who happens to be a complete liar and whose politics you may like no better (if you nominate Romney).
I said early on in this campaign season that the election would likely end up like 2004, where a relatively unpopular President managed to knock out a thoroughly disagreeable challenger. I still think that could well happen - we shall see. If it does, it will be an undeniable statement about the dysfunction in the GOP, which SHOULD be able to win the election given this economy and this President's poll numbers.