WAKEFIELD — Wakefield voters tomorrow have a chance to take part in party primary elections for a slew of statewide offices.

Polling places open at 7 a.m. and close at 8 p.m.

Those who participate will pick the people they would like to see represent the Democratic and Republican parties in the critical November 4 election.

The primary elections will probably be pretty lightly attended, but there are some interesting races to be decided.

Middlesex District Attorney Marian Ryan, appointed by Gov. Deval Patrick when Gerry Leone stepped down, will face off against fellow Democrat Michael A. Sullivan of Cambridge. This has become a contentious race; Sullivan uses any negative news about the DA’s office against the current office holder, while Ryan and her campaign people question Sullivan’s experience and success as a prosecutor. Whoever wins the Democratic primary tomorrow will be the next district attorney because no one is running in the Republican primary.

Donald Berwick, Martha Coakley and Steven Grossman are running to represent the Democratic Party as the fall gubernatorial candidate. The winner will face either Republican Charles D. Baker or Mark R. Fisher.

Leland Cheung of Cambridge, Stephen J. Kerrigan of Lancaster and Michael E. Lake of Boston are Democrats running for lieutenant governor. The victor will face Karyn Polito in November.

Democrats Maura Healey and Warren Tolman want to be the next attorney general, as does Republican John B. Miller of Winchester.

Three Democrats are vying for the treasurer’s seat. Thomas Conboy is a current state representative, Barry Finegold is a current state senator and Deborah Goldberg is a former Brookline selectman. Michael James Heffernan of Wellesley is the Republican running for treasurer.

And finally — and possibly most importantly — is the race for Congress. Main Street’s Richard Tisei will represent the Republicans this fall, but who knows about the Democratic side?

Incumbent John F. Tierney is unpopular with many, to say the least. And his campaign people must be a little nervous, given the negative ad Tierney’s been running against Salem businessman and war veteran Seth Moulton. The other Democrats in the primvary race are Marisa DeFranco, John Patrick Devine and John J. Gutta.

Those registered voters in Precincts 1 and 7 vote at the Masonic Lodge on Salem Street; those living in Precincts 2 and 3 vote at the Crystal Community Club on Preston Street. Precinct 4 voters cast ballots at the Most Blessed Sacrament Church. And those in Precincts 5 and 6 vote at the West Side Social Club.