Sunday on 'This Week': Tim Pawlenty and David Axelrod

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Following Mitt Romney's selection of Wisconsin Rep. Paul Ryan as the Republican vice presidential nominee, Obama campaign senior adviser David Axelrod and former Minnesota Governor Tim Pawlenty speak with George Stephanopoulos on the 2012 presidential contest, Sunday on "This Week."

Standing in front of the USS Wisconsin in Norfolk, Va., Saturday morning, Romney announced Ryan as his vice presidential running mate, launching a swing-state bus tour this weekend. How will Romney's selection of Ryan, a 42-year-old seven-term Republican from Janesville, Wis., impact the race? Will Ryan's selection galvanize conservatives behind Romney this fall? Or will the House budget committee chairman's proposals on Medicare polarize undecided voters?

David Axelrod and Tim Pawlenty discuss Paul Ryan's selection and the latest in the 2012 election, Sunday on "This Week."

Then, the "This Week" powerhouse roundtable debates Romney's vice presidential pick and all the week's politics, with ABC News' Cokie Roberts, former Vermont Governor and founder of Democracy for America Howard Dean, Wall Street Journal Editorial Page Editor Paul Gigot, California Lieutenant Governor Gavin Newsom, host of Current TV's "The Gavin Newsom Show," and Wall Street Journal columnist Peggy Noonan.

With just two weeks before the Republican convention in Tampa, how does Paul Ryan's selection as Romney's running mate change the general election debate? What factors drove Romney's decision, and will Ryan help or hurt Romney's chances on Election Day? And as the campaigns continue battling for voters in battleground states, have the ad wars gone too far? Can either candidate make a positive case for their election, or will negative attacks continue to drive the campaign?

Plus, "This Week" takes its weekly trip down memory lane in "What Year Was It?" See the whole political picture, Sunday on "This Week."