When the Boston Red Sox come to Washington next week for a three-game interleague series, they’ll bring one of baseball’s best records and an impassioned Northeastern fan base. They’ll also bring in a major league cash haul for members of Congress.

More than a dozen lawmakers — including seven from Massachusetts and its neighboring states (aka Red Sox Nation) — have scheduled fundraisers at Nationals Park when the Sox come to town to play the cellar-dwelling Washington Nationals.

For between $1,500 and $5,000, lobbyists and political action committee managers can take in a game and a beer with a powerful lawmaker who controls the fate of legislation they’re paid to sway.

Donors who give $5,000 to Rep. John Larson (D-Conn.) get two tickets to the game, plus the chance to watch batting practice from the exclusive President’s Club seating area beforehand, according to his invitation. Rep. Jim Langevin (D-R.I.) says donors will enjoy a pregame “dinner reception at the President’s Club, then enjoy the game in the best seats in the house — behind home plate!”

Langevin — a big Sox fan, according to his spokeswoman, Joy Fox — quickly sold out 50 tickets for between $1,500 and $2,500 a pop. Not a bad markup, when you consider the face value was $200 each.

“Baseball and politics [are] two American pastimes. We thought it would be fun to bring the two together,” said Fox, who said her boss had never planned a fundraiser at a game until now.

A fundraiser whose clients were not holding fundraisers at the Sox-Nats’ series said baseball games “provide a great way to shake things up a bit and do something a little different, rather than the same old boring lunch or dinner at the National Democratic Club or the Capitol Hill Club.”

Baseball fundraisers are pretty common, said Nancy Watzman, who has posted dozens of invitations to fundraisers at the Ole Ballgame on the “Party Time” blog she maintains through the nonpartisan watchdog group Sunlight Foundation.

Still, she said the volume of fundraisers for next week’s series, which runs from Tuesday through Thursday, “seems to be a lot, proportionately and anecdotally speaking. I guess I’d attributed that to the, ahem, rather fervent level of fandom practiced by members of the Red Sox Nation.”

Several fundraising professionals agreed that the Red Sox, a team known for an ardent New England fan base, seem to attract more fundraisers when they come to Washington than most other visiting teams.

A Democratic operative who helped organize an event for a client at one of next week’s games explained that baseball-game fundraisers are often “member-driven, especially when the Red Sox come to town. You think about the Northeast as being a Democratic bastion, so on our side, there are a lot of fans in Congress.”

The operative, who did not want to be identified discussing client business, said that, of the 20 seats in the luxury box purchased for the game, five are slated to be filled by the client’s family.