AdvertisementIn Tense Exchange, Biden Calls Iowa Voter A 'Damn Liar,' Challenges Him To IQ TestDecember 05, 2019Bobby AllynfacebookEmailFormer Vice President Joe Biden at a town hall last month in New London, N.H. On Thursday, Biden got into a heated exchange with an Iowa voter, calling the man a "damn liar." (Erin Clark for The Boston Globe via Getty Images)