Left to right, former Vice President Joe Biden, Massuchusetts Sen. Elizabeth Warren and South Bend, Ind. Mayor Pete Buttigieg react on stage during the Democratic Presidential Debate at Otterbein University.

Left to right, former Vice President Joe Biden, Massuchusetts Sen. Elizabeth Warren and South Bend, Ind. Mayor Pete Buttigieg react on stage during the Democratic Presidential Debate at Otterbein University.