What is Mitt Romney Hiding in his Taxes and Why Not Disclose Them?

The more I listen to Mitt Romney - the more I realize just how much of a snake he is. Watch the video below from the January 19th GOP presidential debate regarding the issue of releasing tax returns. One has to wonder what 'slick-Mitt' is hiding. Is it the off-shore accounts with the millions in the Cayman Islands he is worried about? Perhaps it is the millions of dollars he 'gifts' to the Mormon church that he is afraid will scare off the GOP Evangelicals; or simply that he pays almost nothing in taxes in proportion to his estimated quarter of a million dollars that he is worth. Whatever his reasoning - I for one don't trust that flip-flopper and apparently - neither does the GOP voters!