If you really want to have some fun with the left, try this appoach:
1.) Denounce the ad as racist. The left will respond "You all are too sensistive. Get a life!"
2.) A week or so later, run an add in the same format except have the President be the boxer with a few talking points. Watch the left go nuts and cry racism.
3.) Then reply: "To quote what you told us after the Allen West ad. You are too sensitive. Get a life!"