TRENDING: Biden to Romney: ‘Show your papers’
Romney rips Obama's tax proposal
Biden: 'Mitt Romney wants you to show your papers, but he won't show us his'
Rep. Chaffetz: No need for Romney to release more tax records
Veepstakes: Portman Met with Romney Aides
Dead Heat in Vote Preferences Presages an Epic Battle Ahead
Obama Trails Romney Again in Battle for Campaign Cash