Sudden GOP frontrunner Herman Cain defended his 9-9-9 tax plan on the talk show circuit today, shooting back at critics who say it would jack taxes for the poor, middle class, and elderly. "There are invisible taxes that are built into everything we buy," said Cain, adding that his plan replaces those "with a 9% visible tax." If people "do the math on their individual situation, I believe more are going to see it's advantageous." Questioned by David Gregory, Cain reaffirmed his February statement that liberals want to "destroy this country" by stunting the business sector, and said that Occupy Wall Street should take their grievances to the White House's door. Cain also shot back at critics questioning his wife's absence from the campaign trail, saying that Gloria Cain "is maintaining the tranquility of (our) family life," and "will be visible at some point, but it'll be based upon when we want her to be visible, not when the powers that be or the media wants her to be visible." Elsewhere on the Sunday dial, as per Politico: