Mitt Romney introduced Representative Paul D. Ryan of Wisconsin as his running mate at a boisterous rally here Saturday morning, a choice that puts the issue of the nation’s fiscal soundness at the center of the presidential race.
Mr. Romney announced his selection after touring the battleship U.S.S. Wisconsin shortly after 9 a.m., ending a four-month search for a running mate. The announcement opens a four-day tour through four critical battleground states, with Mr. Romney and Mr. Ryan poised to travel together to kick off the debut of their new partnership.
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