Analysis: Biden gives Obama old-school cred Story Highlights Barack Obama chooses Sen. Joe Biden as his running mate Biden was first elected to the Senate in 1972; chairs key committees CNN's John King: He'll appeal to Catholic voters, working-class voters Strategist Paul Begala: Biden needs to link McCain to Bush Next Article in Politics » Read VIDEO By Ed Hornick CNN DENVER, Colorado (CNN) -- Sen. Barack Obama's choice of Sen. Joe Biden as his running mate raises the question of whether Obama can carry off his message of change