Bruce Springsteen's White House performance led to his Broadway show. In an exclusive clip from «Amazing Grace: American Music,» the upcoming episode of Springsteen and Barack Obama's podcast, the men recall the music legend's performance at the White House when Obama was president.Before Obama left office and opened at the Walter Kerr Theatre, the 59-year-old politician requested the 71-year-old musician's presence at an event for his staff that had gone through the «really remarkable but