7 things to know now: Dems debate; film claims Combs killed Tupac

Here's a roundup of news trending across the nation and world today.

What to know now:

1. Democratic debate: It was a one-on-one, no-holds-barred event Thursday as Hillary Clinton and Bernie Sanders clashed in the fifth Democratic debate. With former Maryland Gov. Martin O'Malley out of the race,  Clinton and Sanders took the gloves off and called each other out on Wall Street power, an accusation of an "artful smear," and who is more progressive. The debate was held in New Hampshire which holds its primary on Tuesday.

2. Other emails: A report from the State Department says former Secretary of State Colin Powell and staffers for former Secretary of State Condoleezza Rice received classified information through personal email accounts. The emails – two received by Powell and 10 received by staff working for Rice – were recently deemed "secret" or "confidential." The emails were discovered as part of a review of the email habits of the past five secretaries of state.

3. Mirra dies: X Games champion biker Dave Mirra was found dead in his truck in North Carolina Thursday, authorities say. The 41-year-old apparently shot himself. Mirra medaled every year from 1995 to 2008 and won 14 gold medals in the X Games.

4. Smug response: Martin Shkreli, who became infamous for buying an AIDS drug for his company then jacking the price up by more than 5,000 percent, refused to answer questions during a congressional hearing on prescription drug prices. Shkreli, 32, asserted his right to protection under the Fifth Amendment then proceeded to smirk, laugh and yawn while legislators tried to ask questions. Shkreli took to Twitter following the hearing and called lawmakers "imbeciles."

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5. NC voting lawsuit: Lawyers have completed  arguments in a  lawsuit aimed at turning over a North Carolina law that requires voters to produce a photo id in order to vote. Opponents of the law, which went into effect in January, say it puts an undue burden on African-Americans and Latinos. Those who support the law say it's simple enough to produce a form of identification to protect against voter fraud. A verdict is not expected until after the state's presidential primary on March 15.

And one more

A documentary released on iTunes this week claims that Sean "Diddy" Combs paid someone to kill rapper Tupac Shakur and Death Row Records mogul Suge Knight,  and, in turn, lost his friend Christopher Wallace, "The Notorious B.I.G." in retaliation. In the documentary, "Murder Rap," filmmaker Mike Dorsey claims that Combs hired a hitman to kill Shakur and Knight on Sept. 7, 1996, and that police have known what happened for some time but have made no arrests. Shakur died a few days after the attack, but Knight survived his wounds. Dorsey says the murder of Wallace, Combs' best friend, was ordered by Knight in retaliation. The Guardian reports that a source close to Combs says the claims in the documentary are baseless.

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