Paul Ryan likes exercise, budget charts and the Green Bay Packers. Joe Biden likes train rides, foreign policy and talking - a lot. In some ways, these presidential ticket No. 2s could not be more different. They are separated in age by nearly three decades, were born to families in different regions of the country and have views on opposite ends of the political spectrum. But in other ways, the 42-year-old Republican congressman and 69-year-old Democratic vice president are very much alike. Both were born to Catholic families in working-class neighborhoods and were young stars in their parties who became experts on the inner workings of Washington.