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

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Good morning. Here are some of the stories we're following today:

1. Clinton, Sanders to Go Square Off in New Hampshire Debate

With the field pared down to two Democratic presidential candidates, former Secretary of State Hillary Clinton and Vermont Sen. Bernie Sanders are set to go head-to-head at 9 p.m. ET Thursday on MSNBC in the latest showdown. Read more in POLITICS.

2. Clinton Emails Held References to Undercover Officers

A handful of emails forwarded to Clinton's personal server while she was secretary of state contained references to undercover CIA officers — including one who was killed by a suicide attack in Afghanistan, according to U.S. officials who have reviewed them. Read more in INVESTIGATIONS.

3. Cruz Digs at Trump: My Kids Are Better Behaved

Ted Cruz has coined a new term for his chief rival's outbursts: a Trumpertantrum. A town hall event in New Hampshire on Wednesday capped off a spirited day for the caucus winner, who hours earlier suggested his two young daughters "are better behaved" than Donald Trump. Read more in POLITICS.

4. Cascade of Endorsements Gives Rubio Momentum

Marco Rubio has more reasons to smile after his strong showing in Iowa, with a flood of endorsements supporting his case that he's the only viable GOP alternative to Cruz and Trump. Read more in POLITICS.

5. Judge Won’t Stop Cosby Trial Due to Old ‘Deal’

A Pennsylvania judge ruled Wednesday that a sexual assault case against Bill Cosby can move forward after finding that a 2005 decision not to charge him with a crime doesn't stop prosecutors from putting him on trial now. Read more in NEWS.

6. Medicaid Births Rose After Planned Parenthood Cut

Women stopped using the most effective types of contraception and more babies were born on the government's tab after Texas cut off funding from Planned Parenthood clinics, a team of Texas researchers said Wednesday. Read more in HEALTH.

7. Five Burning Questions About the Zika Virus

Dallas County health officials say the case of two people infected with the Zika virus there almost certainly constitutes sexual transmission — something health experts knew was possible but which has only been seen to happen once. The incident now raises even more questions about the already mystifying virus. Read more in HEALTH.

Nightly Spotlight

Caught on camera by conservationists, the big cat lives in the mountains south of Tucson, Arizona. It is the only known wild jaguar in the United States.

Breaking News Emails

Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.