The Choice 2012: Incumbent or Challenger? Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email US President Barack Obama and Republican presidential candidate Mitt Romney share a laugh October 3, 2012 at the conclusion of the first presidential debate. ( MANDEL NGAN/AFP/GettyImages ) Produced by Elizabeth Ross Produced by GBH, PRI and WNYC