By Veronica Rocha and Brian Ries, CNN
CNN projects incumbent Sen. Bernie Sanders, an independent who caucuses with the Democratic Party, will win the Democratic nomination in Vermont.
As he has done previously, he is expected to decline the party's nomination and then run as an independent in the general election.
Retiring Democratic Gov. Dan Malloy's deep unpopularity in this state have Republicans eyeing the Connecticut gubernatorial race as a potential pickup during an otherwise tough election cycle.
Malloy chose not to seek reelection even though he was not term limited. Here's who running to replace him on the Democratic ticket:
The winner of that contest will face one of five Republicans:
The race is expected to be highly competitive in November.
It's 8 p.m. ET and the polls just closed in Connecticut, where Democratic Sen. Chris Murphy is up for re-election.
Murphy is unopposed in his primary, and likely to face Republican Dominic Rapini in the general election.
What to watch: Gov. Dannel Malloy announced he would not seek re-election to a third term last year, setting off a competitive gubernatorial race in 2018.
Democratic businessman Ned Lamont and GOP New Britain Mayor Erin Stewart are the favorites to emerge from crowded primary fields.
Christine Hallquist is running in the Democratic primary in Vermont.
If she wins, she could become the first transgender gubernatorial nominee in the US.
Hallquist, former CEO of Vermont Electric Coop, who is running on a platform of environmental and economic justice, transitioned in 2015.
"I was sure I was going to lose my job. I was sure I was going to lose respect. But that didn't happen," Hallquist said.
"So this describes the beauty of Vermont. So now I'm at this point where I can't do enough to give back to Vermont."
Polls just closed in Vermont, where former energy executive Christine Hallquist is running to become the nation's first transgender nominee for governor.
Vermont is one of two states where governors serve two-year terms rather than the more common four.
Who's running
On the Senate side, incumbent Bernie Sanders, an independent who caucuses with the Democratic party, will likely win and then decline that party's nomination. Sanders will then run (and most likely win) as an independent in the general election.
From CNN's Marlena Baldacci
Ethan Sonneborn, 14, wants to be governor of Vermont. Not when he grows up, but now.
And thanks to the fact that there are no state laws that require gubernatorial candidates to be a certain age, Ethan is officially the youngest candidate to run for that office in Vermont history.
So, what's his platform? Stricter gun control, legislation he said his home state needs.
His platform has featured gun control since he announced his candidacy in 2017.
Ethan acknowledges hunting is an important part of life in New England.
"It's a culture that I respect," he said. "But if it's making the decision between letting my friends have a good time at a firing range and them possibly being involved in a school shooting, I'm choosing legislation to protect them from that school shooting."
Ethan sais part of his campaign is intended to disrupt the status quo.
"There's always been a sense of, 'We don't talk about that in politics.' That's what I wanted to change," he said.
"I wish it didn't take a tragedy for us to become involved in a national dialogue about how we move forward, but we can't go back in time and make it that Parkland didn't happen. And while we're in this moment, I think it's a good opportunity to make change."
Primary races are underway today in Wisconsin, Minnesota, Vermont and Connecticut.
Here's when we expect all the polls to close tonight:
Voters head to the polls today to cast their ballots in four states — Connecticut, Minnesota, Vermont and Wisconsin.
These are the top races we're watching: