Romney's Choice of Ryan Sets Contours For Campaign

Mitt Romney and his new running mate, Paul Ryan, are pitching themselves as "America's Comeback Team," Republican turnaround artists willing to take on tough decisions.

President Barack Obama and his allies say adding the conservative Wisconsin congressman to the GOP ticket creates a sharp choice for voters on the future of the nation's tax system and safety-net programs, such as Medicare and Social Security.

Romney's selection of Ryan as his vice presidential running mate this weekend jolted the presidential contest and set the contours for the fall campaign.

Romney touts himself as a proponent of a friendlier business climate seeking to revitalize the economy and rein in federal spending.

Obama casts himself as a defender of middle-class families and federal spending on health care, retirement pensions and education.