Bruce Shapiro's USA, Marwan Barghouti to run for Palestinian president, plus a lost cantata rediscovered

Bruce Shapiro looks at the fight inside the Democrats between emerging populists and a conservative group called The Third Way. Imprisoned Palestinian leader Marwan Barghouti's son talks about his father plans to run for president of the Palestinian Authority, from jail. Plus how an Australian harpsichord player discovered a three-hundred-year-old cantata by a Venetian contemporary of Antonio…