In a much anticipated announcement Saturday morning, Mitt Romney significantly changed the 2012 race for the presidency when he announced Representative Paul Ryan of Wisconsin as his running mate. Ryan is the author of the controversial House Republican budget plan that would dramatically reduce the size of the federal government, mostly by changing the way Medicare is funded. The proposal also would cut tax revenues by over $4 trillion. How does the Romney/Ryan ticket change the 2012 election and what does it tell us about the campaign the GOP will run? What does history tell us about the kind of candidate who makes a successful running mate and then a valuable partner in the White House? In this hour of Radio Times, to answer all these questions and more, we’ll talk with St. Louis University School of Law professor JOEL GOLDSTEIN who studies and writes about the American vice presidency and JIM TANKERSLEY of the National Journal.