Martin O'Malley, Hillary Clinton, Bernie Sanders

The fourth Democratic 2016 presidential debate featured former Maryland Gov. Martin O'Malley, left, former Secretary of State Hillary Clinton and Sen. Bernie Sanders, I-Vt. The three greeted supporters before the start of the NBC News-YouTube Democratic presidential debate at the Gaillard Center in Charleston, S.C., on Sunday, Jan. 17, 2016. (AP Photo/Mic Smith)

(Mic Smith)

WASHINGTON, D.C. - Who do you think won the Democratic presidential debate on Sunday night?

The three Democratic presidential candidates battled each other for two hours in a prime-time debate broadcast live by NBC from the Gaillard Center in Charleston, S.C.

It was the fourth Democratic debate of the 2016 presidential election, and the last before next month's Iowa caucuses and New Hampshire primary.

Hillary Clinton and Bernie Sanders, locked in a tight battle in the polls, made their final appeals to the early voters, while Martin O'Malley tried to present himself as a viable alternative to the Democratic frontrunners.

The NBC-News/YouTube debate began with a focus on guns, police violence, the drug epidemic and criminal justice reform.

Clinton hammered Sanders about his change in support for giving gun manufacturers immunity from legal prosecution, and said he voted to allow people to carry guns on Amtrak trains and at National Parks. But Sanders said Clinton was disingenuous about changes in his positions.

The Democratic candidates also spent several minutes sparring over their plans to build upon or revise the Affordable Care Act, or Obamacare.

Clinton suggested the plan offered by Sanders would essentially tear up Obamacare, but Sanders said he only seeks to improve the landmark healthcare law.

Later, the candidates were asked about their competing plans for the economy and Wall Street reform. Sanders argued it was time to break up the big banks.

Clinton said the Dodd-Frank financial reforms passed by Congress already give the federal government the authority to break up big banks.

Clinton said her plans for financial reform are the ones Republicans and Wall Street fear the most: "I'm the one they don't want to be up against," Clinton said.

In the end, who do you think won the debate? Please vote in the unscientific poll above, and share your comments below.

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