The second Democratic presidential debate

Bernie Sanders (left) , Hillary Clinton (middle) and Martin O'Malley (right) gesture as they speak during a Democratic presidential debate at Drake University.

Hillary Clinton listens to Bernie Sanders during a Democratic presidential debate at Drake University.

"Face the Nation" anchor John Dickerson (L) listens to a crewmember prior to a presidential debate sponsored by CBS at Drake University.

Martin O'Malley (right) reacts to Hillary Clinton during a Democratic presidential debate at Drake University.

From left Bernie Sanders, Hillary Clinton and Martin O'Malley on stage during a Democratic presidential debate at Drake University.

Bernie Sanders speaks during a Democratic presidential debate at Drake University.

Hillary Clinton supporters watch the debate at the Olmsted Center during a Democratic presidential debate.

Hillary Clinton speaks to Bernie Sanders during a Democratic presidential debate at Drake University.

Bernie Sanders greets Hillary Clinton after a Democratic presidential debate at Drake University.

Martin O'Malley gestures after a Democratic presidential debate.

Hillary Clinton reacts after the Democratic presidential debate at Drake University.

Martin O'Malley reacts after a Democratic presidential debate at Drake University.

Hillary Clinton reacts after the Democratic presidential debate.

Members of the media watch the Democratic presidential debate at Drake University.

From left, KCCI anchor Kevin Cooney, Des Moines Register political columnist Kathie Obradovich and CBS News Congressional Correspondent Nancy Cordes wait for the beginning of a presidential debate sponsored by CBS at Drake University on November 14, 2015 in Des Moines, Iowa.

Hillary Clinton looks on as Bernie Sanders (left) looks down at his watch during a Democratic presidential debate at Drake University.

Hillary Clinton takes the stage as she is introduced during a Democratic presidential candidate debate at Drake University.

Hillary Clinton listens to Martin O'Malley during a Democratic presidential debate.

Bernie Sanders waves as he is introduced on stage during the Democratic presidential candidate debate at Drake University.

Bernie Sanders, Hillary Clinton and Martin O'Malley take the stage for a Democratic presidential debate at Drake University.

Hillary Clinton and Bernie Sanders walk to the debate stage during a Democratic presidential candidate debate at Drake University.

Hillary Clinton and Martin O'Malley are introduced during a Democratic presidential debate at Drake University.

From left Bernie Sanders , Hillary Clinton and Martin O'Malley waves to the crowd as they take the stage during a Democratic presidential debate at Drake University in Des Moines.

A large digital Twitter trending screen is seen in the spin room prior to the Democratic presidential primary debate at Drake University.

A woman with packed bags attempts to enter the secure debate entry point without tickets or credentials claiming to have been invited by DNC chair Debbie Wasserman Schultz. After the woman demanded DNC staffers contact Debbie Wasserman Schultz, the DNC staffers returned with no knowledge or ability to let the woman who claimed to have just arrived from New York into the debate sending the woman into a fit of rage and screaming while shaking of security fence at Drake University. Security was called but the woman left the area before officers arrived.

Broadcast journalists stand up for live shots before the Democratic presidential primary debate at Drake University.

People wait to enter security before the Democratic presidential primary debate at Drake University.

Paige McKibben of Des Moines holds a sign sending condolences to the people of Paris on the sidewalk outside before a Democratic presidential debate at Drake University.

Shayna Daitch, 27, of Oklahoma City, OK, takes a photo of herself and friends who belong to the Young Democrats of America while waiting in long line of people preparing to enter security before the Democratic presidential primary debate at Drake University.

Caitlyn Carpanzano, right, and Liz Plank, both from Mic, a digital media company, carry balloons into the Drake University Cartwright Hall, which is serves as the debate spin room for the Democratic presidential primary debate at Drake University.

Democratic presidential candidates Martin O'Malley and Bernie Sanders shake hands prior to the Democratic presidential debate Sheslow Auditorium on the campus of Drake University.

Democratic National Committee chair Debbie Wasserman Schultz walks to the Sheslow Auditorium at Drake University before the Democratic presidential primary debate.

A general view of a press and media walk through prior to the Democratic presidential debate Sheslow Auditorium on the campus of Drake University.

MJ Gazali and Preshai Paulding of Des Moines pose for a photo with John Jarecki of Omaha in a homemade Bernie Sanders costume before the Democratic presidential candidate debate at Drake University.

Martin O'Malley supporters hold a rally before a Democratic presidential debate at Drake University.

Security fencing is placed along University Avenue as security personnel sweeps the area around Drake University before the Democratic presidential primary debate.

Brian Heath makes a Bernie Sanders painting on the sidewalk before a Democratic presidential candidate debate at Drake University.

Security sweeps the area around the secure sites at Drake University before the Democratic presidential primary debate at Drake University.