Obamas verbale Schrotflinte

dapdVice President Joe Biden speaks in Council Bluffs, Iowa, Thursday, Oct. 4, 2012. (Foto:Nati Harnik/AP/dapd)

REUTERSU.S. Vice President Joe Biden addresses the final session of the Democratic National Convention in Charlotte, North Carolina in this file photo taken September 6, 2012. With his debate against Republican vice presidential nominee Paul Ryan coming

dapdVice President Joe Biden speaks to supporters on Tuesday, Oct. 2, 2012 in Charlotte, N.C. at The Fillmore. Biden said Tuesday that the middle class has been "bu" duriduring the past four years, a statemenat Rlicalicans immediately seizeeized upon as a

dapdVice President Joe Biden speaks during a campaign event at the Century Village Clubhouse in Boca Raton, Fla., Friday, Sept. 28, 2012. (Foto:Terry Renna/AP/dapd)

dapdVice President Joe Biden greets supporters during a campaign event at the Century Village Clubhouse in Boca Raton, Fla., Friday, Sept. 28, 2012. (Foto:Terry Renna/AP/dapd)

dapdVice President Joe Biden makes a point during a campaign speech, Wednesday, Sept. 12, 2012, at Wright State University in Dayton, Ohio. (Foto:Al Behrman/AP/dapd)

dapdVice President Joe Biden visits with patrons over lunch at Cruisers Diner, Sunday, Sept. 9, 2012, in Seaman, Ohio. (Foto:Carolyn Kaster/AP/dapd)

dapdVice President Joe Biden reaches out to hold four-month-old Simon Hamill from his dad Kyran, of Eau Claire, Wis. after Bidens campaign event, Thursday, Sept. 13, 2012, at the Zorn Arena on the University of Wisconsin-Eau Claire campus. (Foto:Stacy Ben

REUTERSU.S. Vice President Joe Biden speaks regarding foreign policy at New York University in New York, April 26, 2012. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS)