Third Democratic Presidential Debate: 9 Moments That Mattered

(MANCHESTER, NH.) -- At the final Democratic presidential primary debate of the year, tensions boiled over gun control, how to combat terrorism and the controversy that dominated the past 48 hours: A breach of the national party’s voter database.

The debate, hosted by ABC News and moderated by “World News Tonight” anchor David Muir and Chief Global Affairs Correspondent Martha Raddatz, featured some of the most intense sparring yet, between former Secretary of State Hillary Clinton, Vermont Sen. Bernie Sanders and former Maryland Gov. Martin O’Malley.

It began with an apology from Sanders to Clinton for a now-fired campaign employee who accessed some of her proprietary campaign data after a glitch from a Democratic National Committee’s computer vendor exposed it.

But that’s where the contrition ended.

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