Election Day 2017: What You Need to Know

Hello, and thank you for spending Election Night 2017 with us. NBC News politics reporters and editors will be live blogging throughout the day and into the evening Tuesday. 

Here’s what you need to know about the four biggest races, and what to watch for as the returns come in.

New Jersey Governor's Race: Republican Lt. Gov. Kim Guadagno vs. Democrat Phil Murphy

New Jersey elections have often elevated centrists, but not this time. The New Jersey gubernatorial race is a battle of partisans. Progressive Democratic candidate Murphy leads the state's Republican lieutenant governor, the unpopular retiring Gov. Chris Christie’s former running mate, in the polls.

What to watch: How do voters decide on key issues? Murphy said he’d support becoming a sanctuary state "if need be" to protect undocumented immigrants; former prosecutor and sheriff Guadagno accused him of protecting criminals. Taxes are the other big talker, with Murphy saying he’ll raise them to pay for his priorities, while Guadagno says she won’t run for a second term if she doesn’t cut the property tax. 

Virginia Governor's Race: Republican Ed Gillespie vs. Democrat Ralph Northam 

Virginia’s gubernatorial race has the potential to be a squeaker. Polls have showed the race tighteningrapidly with Gillespie closing the gap on Northam, who was leading by double digits early last month.

What to watch: Trump has loomed over this contest, with Gillespie promising to protect Confederate statues and running TV ads highlighting MS-13 gang violence, and it could be a measure of how Virginians' feel about the president. Most likely voters in the Washington Post-Schar School poll said their view of president was important to their decision.

Utah's 3rd Congressional District: Republican John Curtis holds lead in crowded race

Utah’s 3rd Congressional district will go to the polls to replace Rep. Jason Chaffetz, who left Congress this summer. Republican nominee John Curtis, the mayor of Provo, Utah, is the favorite in the red district; he faces Democrat Kathie Allen, new moderate conservative party United Utah candidate Jim Bennett, one Libertarian, an independent and two approved write-in candidates.

What to watch: Does United Utah garner a substantial share of the vote? This is the first time the newly-formed party will appear on a general election ballot.

New York City Mayoral Race: Incumbent Democrat Bill de Blasio vs. a slew of small challengers

New York City mayor Bill de Blasio is likely headed toward re-election in New York City despite limited time on the campaign trail and less than stellar approval ratings. He's got four opponents, including Republican challenger Nicole Malliotakis, a state assemblywoman. An NBC 4 New York/Marist poll saw 58 percent of likely voters citywide supporting de Blasio, with just 16 percent supporting Malliotakis. 

What to watch: Just how many people vote against this unpopular, but powerful, incumbent. 

That's a Wrap

Here are key highlights from the Election 2017 live blog on NBC News:

  • Democrats began what they hope will be the start of a major political comeback Tuesday, nearly one year to the day Donald Trump pulled off an upset victory that left the party demoralized, leaderless and pointing fingers.
  • Virginia Democrat Ralph Northam easily cruised to victory over Republican Ed Gillespie in a race in that looked as if it had been tightening in recent weeks. The success translated down the ballot as well, with Democrats making major gains in the state legislature.
  • In New Jersey, Democrat Phil Murphy soundly defeated Lt. Gov. Kim Guadagno. Guadagno proved unable to separate herself from Gov. Chris Christie, who will leave office as one of the nation’s most unpopular elected officials.
  • Democratic New York City Mayor Bill de Blasio handily won a second term, while voters in Maine chose to expand access to Medicaid, overruling the state's Republican governor.

Northam Rebukes Trump Without Naming Him in Victory Speech

Virginia Gov.-Elect Ralph Northam condemned the president and promised unity in his victory speech on Tuesday night. 

“Today, Virginia has told us to end the divisiveness, that we will not condone hatred and bigotry, and to end the politics that have torn this country apart,” the Democrat and former military doctor said. “In Virginia, it’s going to take a doctor to heal our differences, to bring unity to our people, and I’m here to let you know that the doctor is in.”

Virginia's gubernatorial race focused on many of the themes that Trump himself ran on, including crime and immigration, with opponent Ed Gillespie running ads that accused Northam of aiding criminal immigrants by casting a tie-breaking vote against a sanctuary city ban while lieutenant governor.

“We live in a very diverse society it is getting more diverse every day, it is that diverse society that makes this country great,” he said. “As governor, I will make sure that we will be inclusive — our doors will be open.”

Northam Victory Speech Disrupted by Apparent Protesters

Virginia Gov.-elect Ralph Northam was rushed off stage by a security official at the start of his victory speech Tuesday night.

Three protesters were seen heckling Northam and holding homemade signs, including one Northam sign with the word "sanctuary" written across it. The protesters appeared to be escorted out of the victory party.

Northam said last week he would sign a ban on sanctuary cities as governor after Republican opponent Ed Gillespie campaigned on threats of MS-13 gang violence. Northam had previously voted against such a ban.

Northam returned promptly to the podium to speak and did not address the disruption.

Virginians Turned Out in Big Numbers Tuesday

Virginians turned out in large numbers Tuesday despite the rainy and cold weather that gripped parts of the state. 

More than 2,500,000 votes had been counted as of 10:16 p.m. Tuesday. That total dwarfs turnout for the past two Virginia gubernatorial elections. 2,240,314 voters cast ballots in 2013, and 1,984,934 voted in 2009. 

Democrats eagerly worked to mobilize voters in the state in an effort to repudiate President Donald Trump one year after his surprise election victory. Republicans were hopeful Virginia, which Hillary Clinton won in 2016, would deliver another surprise blow to Democrats. 

Republican John Curtis Wins Utah Special Election, NBC News Projects

Republican John Curtis, the mayor of Provo, Utah, won the special election for Utah's 3rd Congressional District, NBC News projects, handily defeating Democrat Kathie Allen.  

With 69 percent of the vote in at 11:05 p.m. ET, Curtis had 59 percent of the vote, while Allen received 26 percent. 

Maine Votes to Expand Medicaid, Flouting GOP

Mainers voted to expand access to Medicaid through the Affordable Care Act on Tuesday, the Associated Press reported, overruling Republican Gov. Paul LePage. 

The ballot measure will give an estimated 80,000 low-income Mainers access to health care. It also offers an important test of the health care law's popularity amid efforts of President Donald Trump and other GOP leaders to dismantle it.

Maine is one of 19 states whose Republican leadership declined to expand access to Medicaid under Obamacare. Maine is the first to use a ballot initiative to expand it anyway, after LePage vetoed five attempts by the state’s legislature to expand the program. 

Maine's ballot initiative could be the first of many: Advocates have filed paperwork to try and get initiatives on the ballot in Idaho and Utah in 2018.

Boyfriend of Slain TV Journalist Elected to Virginia Statehouse

Democrat Chris Hurst, a former television journalist whose girlfriend was shot on live television, was elected to Virginia's House of Delegates on Tuesday.

The Associated Press declared Hurst the winner over Republican Joseph Yost in what was one of the state's most expensive House of Delegates campaigns. 

Hurst spent six years as a reporter for WDBJ-TV where he met Alison Parker, a 24-year-old reporter shot and killed during a live broadcast in 2015. 

Exit Polls: Virginia Democrats Make Gains Among Voters Under 30

Virginia's Democratic Gov.-elect Ralph Northam picked up picked up support among a large number of subgroups Tuesday night, especially among voters under 30, white women, moderates and those with college degrees. 

Among white women and voters under 30, Democrats improved on their margins compared to 2013 largely by taking support from Libertarian candidates.

Among white women voters, Gillespie was still the favored candidate over Northam, but the Democratic candidate brought the edge to a 3-point margin.

New York City Mayor Bill de Blasio Wins Re-Election, NBC News Projects

Democratic incumbent Bill de Blasio cruised to re-election Tuesday in New York City, NBC News projects. 

The mayor was expected to win handily despite less-than-stellar approval ratings, as he lacked a serious challenger in the general election or the primary before it.

De Blasio is the first Democratic mayor to win re-election since Ed Koch's third-term election in 1985; he ran a low-key campaign that championed his investments in housing and education, namely free prekindergarten, his chief first term win.

Democrats Make Major Gains in Virginia State House

Virginia Democrats have picked up 10 House of Delegates seats and lead in seven more races, putting them within striking distance of taking the majority in the state legislature. 

Democrats needed to flip 17 seats heading into Tuesday to retake the majority. And while the gubernatorial contest between Democrat Ralph Northam and Republican Ed Gillespie has dominated national attention, the 100 seats in the state’s House of Delegates could end up being the true bellwethers to gauge Democratic Party's strength ahead of the 2018 midterms. 

Virginia House Democratic Leader David Toscano called the results “unprecedented,” noting that the last time Democrats won more than five seats in a single year was 1975. "This isn't a wave, this is a tsunami,” he told NBC News.

Alex Seitz-Wald contributed reporting from Fairfax, Virginia.

DNC Chair: Virginia Is 'Blueprint' For New Democratic Party

Democratic National Committee Chair Tom Perez heralded Democrat Ralph Northam’s win in Virginia as “a blueprint for what we’re doing everywhere.”

“This is a really important night, and it’s not only an important night for Virginia, but it’s a blueprint for what we’re doing everywhere which is competing in every zip code, and telling our story,” he told MSNBC’s Chris Hayes. 

The DNC has been embroiled in scandal after a new book by former interim chair highlighted a fundraising deal between the Clinton campaign and the Committee well before she’d won the nomination, earning further calls of a “rigged” election by the president.

“The new DNC demonstrated its commitment to organizing for our values,” Perez said in a statement emailed to reporters minutes later. “Tonight’s success is just the beginning."