The Obama Factor: Presidential Visits and the Midterms 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 U.S. President Barack Obama walks from Marine One on the South Lawn of the White House November 2, 2010 in Washington, DC. ( Olivier Douliery-Pool / Getty ) Produced by PRI and WNYC