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KNOW IT ALL: Friday's Top 7 Stories at NBC News

Good morning. Here's a look at some of the headlines we're following this morning:1. Donald Trump's Lead Slashed in South Carolina: PollTrump is

Good morning. Here's a look at some of the headlines we're following this morning:

1. Donald Trump's Lead Slashed in South Carolina: Poll

Trump is now leading Saturday’s South Carolina Republican primary by 5 points — down from his 16-point lead in the state a month ago, according to results from a new NBC News/Wall Street Journal/Marist poll. Read more in POLITICS.

2. Clinton, Sanders Answer Voters at Vegas Town Hall

As the Democratic presidential candidates spar over who would best uphold President Obama’s legacy, Sen. Bernie Sanders Thursday suggested Obama has faced racist opposition from Republicans while also refusing to disown his one-time call for a primary challenger to the president. Read more in POLITICS.

3. 'I Guess So': Trump Supported Iraq War in 2002 Interview

Donald Trump's opposition to the invasion of Iraq is under scrutiny. A 2002 interview with Howard Stern shows Trump saying that he did, in fact, support the invasion. "Yeah, I guess so," Trump told Stern when asked directly. "I wish the first time it was done correctly." Read more in POLITICS.

4. Is Philadelphia's Water Safe to Drink?

Philadelphia’s water passed its last round of lead testing with flying colors, but documents obtained by NBC News show those results may offer a misleading picture of the lead flowing from Philly taps. Read more in NEWS.

5. Bundy Son Speaks Out: We Were Defending Our Property

A judge on Thursday ordered Nevada rancher Cliven Bundy returned to his home state to face charges from a famous 2014 armed standoff with federal authorities, while one of his sons accused the government of “overreaching.” Read more in NEWS.

In a Wednesday, Jan. 27, 2016 file photo, rancher Cliven Bundy speaks to media while standing along the road near his ranch, in Bunkerville, Nev.John Locher / AP file

6. Anxiety Drug Overdoses Have Quadrupled, Study Finds

More Americans than ever are overdosing on anxiety drugs, researchers reported Thursday — and it’s not clear why. The new study finds not only that more Americans are taking the drugs, which include brand names such as Valium and Xanax, but that they’re taking more of them. Read more in HEALTH.

7. A Third of Americans Aren't Getting Enough Sleep

More than a third of Americans say they’re are not getting enough sleep, putting themselves at risk of obesity, heart disease and other issues, federal researchers said Thursday. The findings also suggest that more Americans need to learn healthy sleep habits — like going to bed at regular times and turning off televisions and other electronic devices, the team at the Centers for Disease Control and Prevention said. Read more in HEALTH.

8. Leonardo DiCaprio's Quest for an Oscar is Now a Video Game

You may not be eligible to vote for Leo, but you can still propel him towards an Oscar win. The race for an Oscar just took on a new meaning, with a free online video game where players chase a cartoon Leonardo DiCaprio down the red carpet in his quest for the ultimate acting accolade. Read more in TECH.