After more than six months, Tuesday's contests will be the final midterm primaries before Election Day.

Technically, one state has yet to hold its primary. Louisiana uses a hybrid system in which there are no nominees and candidates run in an all-party primary on Nov. 8. Candidates receiving a majority of the vote win office; otherwise, the top two meet in a runoff.

New Hampshire, Rhode Island and Delaware are holding primaries Tuesday, and some races could help decide the balance of power on Capitol Hill.

New Hampshire

Incumbent Sen. Maggie Hassan, who was first elected in 2016, is expected to survive a pair of challengers in the Democratic primary — retired dentist Paul Krautmann and John Riggieri, a convicted animal abuser — but she is considered vulnerable in the general election.

Meanwhile, there are 11 candidates running for the Republican nomination. According to polls, the front-runners are retired Army Brig. Gen. Don Bolduc and state Senate President Chuck Morse.

Bolduc has aligned himself with former President Donald Trump, promoted Trump’s false claims that the 2020 election was stolen and called the state’s Republican governor, Chris Sununu, a “Chinese communist sympathizer.” 

Morse, who’s been endorsed by Sununu and Senate Majority Leader Mitch McConnell, has been campaigning on his extensive political experience while attacking Bolduc as a conspiracy theorist. 

Bolduc has held a comfortable lead — as much as 21 percentage points — in recent polling. Democrats have spent millions attacking Morse, likely believing Bolduc represents their easier path to victory in the general election.

Hassan defeated Republican incumbent Kelly Ayotte by a little more than 1,000 votes, and the nonpartisan Cook Political Repot rates the seat as leaning Democratic.

Cook, meanwhile, rates both of the Granite State’s House races as toss-ups. The Democratic nominees in both are already locked in, as incumbents Chris Pappas and Annie Kuster were unopposed.

But like the Senate race, there are crowded fields in the GOP primaries. 

In the 1st District, which Pappas represents, there are 10 GOP hopefuls. They include two former Trump White House aides — Matt Mowers and Karoline Leavitt — as well as state Rep. Tim Baxter and ex-TV reporter Gail Huff Brown, who is married to former Massachusetts Sen. Scott Brown. Mowers and Leavitt have sat atop most polls.

While both Mowers and Leavitt support Trump and differ little on policy, they have starkly different styles. Mowers, who has acknowledged Joe Biden received the most votes in the 2020 presidential election but has expressed reservations about voting “irregularities,” is more measured in his public statements. Leavitt, who has repeated Trump’s lies about the election, is more provocative. 

The race has divided GOP leadership. House Minority Leader Kevin McCarthy and Rep. Steve Scalise of Louisiana, the No. 2 Republican in the House, are among those who have endorsed Mowers. Leavitt is backed by hard-right Republicans such as Sen. Ted Cruz of Texas, Jim Jordan of Ohio and Elise Stefanik of New York, her former boss.

In the 2nd District, seven Republican candidates are vying to take on Kuster, who is seeking her sixth term. Keene Mayor George Hansel and former Hillsborough County Treasurer Robert Burns have led in the polls, but there had been a large number of undecided voters. Hansel is a rare Republican who supports abortion rights. That could hurt him in the primary but help him if he reaches the general election in a purple district.

New Hampshire is also voting on governor. Sununu is heavily favored to fend off five Republican challengers as he seeks a fourth two-year term. State Sen. Tom Sherman ran unopposed for the Democratic nomination.

Rhode Island

Rhode Island residents also are voting on two House seats, but only one is rated as competitive by the Cook Political Report. 

In the 2nd District, six Democrats are running to replace Rep. Jim Langevin, a Democrat who is retiring after 11 terms. State General Treasurer Seth Magaziner, whom Langevin and the state party have endorsed, is the heavy favorite, polls indicate. His opponents include former Commerce Department lawyer Sarah Morgenthau and state Rep. David Segal. 

The Democratic nominee will take on Cranston Mayor Allan Fung, the unopposed Republican nominee.

The nominees in the 1st Congressional District are already set. Democratic incumbent David Cicilline will face Republican Allen Waters, a former investment consultant, in November. Two years ago, Cicilline won reelection with 71% of the vote.

But arguably the most intriguing race in Rhode Island is for governor. Democrat Dan McKee ascended to governor early last year after President Joe Biden plucked then-Gov. Gina Raimondo to become his commerce secretary. 

McKee, however, has not been a popular governor and faces stiff competition within his party. A Morning Consult poll in July not only had his favorability rating underwater (43% disapproved, 38% approved), it ranked last among all incumbent governors.

Yet, an August poll by WPRI-TV and Roger Williams University had McKee narrowly ahead of of Secretary of State Nellie Gorbea 28% to 25% in the Democratic primary, with 21% of voters still undecided. Gorbea would be the first Latina to be elected governor in New England.

Also running for the Democratic nomination are former CVS Health executive Helena Foulkes, former Rhode Island Secretary of State Matt Brown and community activist Luis Daniel Muñoz.

Running for the Republican nod are Ashley Kalus and Jonathan Riccitelli. 

Kalus is a businesswoman who has lived in Rhode Island for a little over a year. 

Riccitelli is relatively unknown in politics, but The Boston Globe reported last week reported he has a lengthy criminal record under the name Jonathan Tefft that includes charges including simple assault, obstructing police and providing false information to 911. He told the newspaper that some of the 36 arrests were not him but rather a result of a mixup with someone of the same name. However, when asked if he was the defendant in any of the charges, he said he wasn’t sure.

Delaware

From a national perspective, Delaware’s primaries Tuesday are moot. The state is not voting on a U.S. senator this year, and the primary for its lone, at-large House seat was canceled because of lack of competition. Democratic incumbent Lisa Blunt Rochester and Republican Lee Murphy, an actor and retired teacher and coach, have automatically advanced to the Nov. 8 general election.