Editor’s Note: This is an excerpt from WBUR’s politics newsletter, Mass. Politics. If you like what you read and want it in your inbox, sign up here.

Welcome back to Mass. Politics, where we’re now counting down the hours until 8 p.m. on Tuesday. In today’s edition: Nearly everybody.

What are the races to watch as primary voting draws to a close Tuesday?

You’ve watched Ed Markey and Seth Moulton clash again and again in Massachusetts’ heated Senate primary. You’ve read about the differences between the two Republicans running to face incumbent Gov. Maura Healey in the general election.

But there are plenty of other contests down the ballot worth keeping an eye on. Will it be an echo of 2018, which saw several incumbent Democrats fall to challengers seeking a new direction in the middle of President Trump’s first term? In blue Massachusetts, the primaries are often the most decisive component of the election cycle. And there are several subplots to watch:

The six-way race in the 6th District: Moulton’s decision to run for Senate has created the first open congressional race in Massachusetts since 2020 — and six Democrats are competing in the primary.

• Dan Koh is a former aide to Boston Mayor Marty Walsh and former President Joe Biden who nearly became a congressman on his first try in 2018.
• Tram Nguyen, an Andover state rep, defeated one of the State House’s most conservative members in 2018 to become the first Vietnamese American woman elected to public office in Massachusetts.
• John Beccia (like “betcha”) is a fintech executive from Lynnfield who’s put nearly $3 million of his own money into his campaign. (Maybe you’ve seen his “You Beccia” ads.)
• Beth Andres-Beck, a Middleton software engineer and activist, originally jumped into the race to challenge Moulton after his comments about transgender children and sports.
• Jamie Belsito is a former state rep from Topsfield who flipped a red district blue in 2021 before her district was eliminated in redistricting.

Mariah Lancaster, a former federal worker and licensed veterinarian from Salem, is on the Democratic primary ballot — but ended their campaign over the weekend and endorsed Nguyen.

There’s a Republican on the ballot, too: Micah Jones, an Army veteran with former Gov. Charlie Baker’s endorsement. But whoever comes out of the crowded Democratic primary field will be considered a heavy favorite in the general election to be the state’s next member of Congress.

📌 Further reading: The Boston Globe has more here on the insider-versus-outsider arguments that have somewhat defined the Democratic primary.

A South Shore surprise? After representing the congressional district just south of Boston for 25 years, Rep. Stephen Lynch is facing perhaps his toughest challenge yet. Patrick Roath, a 39-year-old lawyer and former political aide, is taking on the more moderate 71-year-old congressman on a platform of generational change and progressive policies. And some recent polling suggests the race could be tightening.

📌 Further reading: WBUR’s Anthony Brooks recently hit the trail with both candidates to hear how they’re making their case to voters.

The prosecutors’ primaries: Three local district attorney races in particular are worth watching.

Boston’s proxy battles: Mayoral machines are nothing new in local politics, and old campaign hands may still tell tales of Tom Menino’s operation over a drink or two. But the current mayor, Michelle Wu, a Menino protege, has taken an extra step. She’s been personally hitting the trail and knocking on voters’ doors for left-leaning challengers to two longtime State House lawmakers (and fellow Democrats) who blocked her property tax shift plan. State Sen. Nick Collins, whose district includes Dorchester, South Boston and the South End, is facing a challenge from Wu-backed education activist Latoya Gayle. Meanwhile, state Sen. Will Brownsberger — who represents Belmont, Watertown and western parts of Boston and Cambridge — is up against former Wu aide Daniel Lander. Both races serve as a test of whether Wu can throw her political weight around like her counterpart in New York.

📌 Further reading: WBUR’s Eve Zuckoff recently moderated a candidate forum featuring Collins, Gayle and a third candidate, Juwan Skeens. The Dorchester Reporter has a recap. Or you can watch the full forum here.

📌 Plus: Brownsberger and Lander also clashed in a recent debate. State House News Service summarizes their main policy disagreements. The Boston Globe reports that race is also pitting the local biotech and real estate industries against each other.

A cascade in Camberville: State Sen. Pat Jehlen’s decision to retire after 35 years in the State House has created a hotspot of elections in Cambridge, Somerville and Medford: elected officials running for Jehlen’s seat, plus a secondary wave of races for those candidates’ seats. Jehlen has backed state Rep. Christine Barber in the primary for her seat. But Barber’s got several locally well-known competitors: fellow state Rep. Erika Uyterhoeven, Somerville City Councilor Matt McLaughlin and Cambridge City Councilor Burhan Azeem. (There are also open races for Barber and Uyterhoeven’s seats.)

📌 Further reading: Axios has a breakdown on the four candidates — all slightly different flavors of progressive — in one of the state’s most left-leaning districts.

Rematch on the river: After squeaking through the 2024 primary by just 40 votes, Cambridge state Rep. Marjorie Decker is facing a familiar foe: union organizer Evan MacKay. As in their first battle, MacKay has tried to make the race a referendum on transparency on Beacon Hill (or lack thereof) while Decker has tried to highlight her record of legislative results.

📌 Further reading: Cambridge Day has a recap of their most recent debate.

P.S.— This newsletter will be off next Monday due to Labor Day, but we’ll be back in your inbox Wednesday to talk about how the primary shook out. And if you don’t want to wait that long, head to wbur.org Tuesday night to see our live election dashboard with counts for the Democratic state primary contest for U.S. Senate, contested U.S. House of Representatives primaries and competitive State House and Governor’s Council races.