And in real life, many middle-class voters feel the same way as a matter of principle.

FORBES: Romney's 'Gifts' Gaffe Highlights GOP Confusion On Obamanomics

Mr. Obama endorsed the political ruse he calls the Buffett rule, which asserts as a matter of moral principle that millionaires should not pay a lower tax rate than middle-class wage earners.

WSJ: Review & Outlook: The Buffett Ruse