Best way to sink his campaign is to introduce more of America to the shittiness that is Godfather's Pizza. Once America wakes up to their cardboard crusts, their sugary sauce, and the carcinogenic cheese, they might realize Cain can't be all that's he cracked up to be.
I remember the crust being a little too margerine-y. However, they had SUPER NOAH'S ARK 3-D in a little kid sized arcade box in the kid's play area, so JUST FOR THAT I'm more positive to Cain than not.