FILE - In this March 20, 2012 file photo, House Budget Committee Chairman Rep. Paul Ryan, R-Wis., holds up a copy of his budget plan entitled "The Path to Prosperity," during a news conference on Capitol Hill in Washington. There are plenty of reasons for Republican presidential candidate Mitt Romney to choose Wisconsin Rep. Paul Ryan as a running mate. The whip-smart congressman is from a battleground state. He?s the GOP?s leading voice on the nation?s budget and is the rare member of the Republican establishment who?s loved by the tea party. (AP Photo/Jacquelyn Martin, File)