Not only is Romney unable to release his tax returns and reveal the TRUE tax rate that enormously wealthy people pay, while the middle class pony up 30-40% of their income: He's such a dunce that he publicly says that paying more would "disqualify" him from the presidency.
If he ever DOES release them, he's toast because the Republican game of using rich people to deceive regular people about what's in their interest will be exposed, and his idiotic statement will make him look that much more callous about it. If he doesn't, he's got something to hide. Not anything criminal: What he's got to hide is the LEGALITY of his tax rate. He's in a lose-lose situation.