What is Romney Hiding?

http://www.cnn.com/2012/07/18/opinion/kleinbard-canellos-romney-tax/index.html?hpt=hp_t1

I don't understand why he's refusing to release more tax returns unless what they reveal is worse than the price he's paying and will keep paying for his reluctance to do what every other candidate has done starting with his own father.

Romney's Impossible Tax Promise (via FactCheck.org)

"Tax experts - including one who supports Romney's plan - say the Republican presidential candidate's promise to cut individual income tax rates without either favoring the wealthy or losing revenue isn't mathematically possible."

http://factcheck.org/2012/08/romneys-impossible-tax-promise/