Sen. Heidi Heitkamp, D-N.D., Tuesday night will join the growing fraternity of lawmakers held in the highest regard by the booze lobby, taking her place among the handful of pols who have previously been honored by the George Washington Spirits Society.

Heitkamp and former Sen. Dirk Kempthorne, R-Idaho, will be inducted into the burgeoning group as part of the annual “Spirit of Mount Vernon” gala held at the first president’s sprawling Virginia estate.

The swanky invite-only affair, which features top-shelf liquor at nearly every turn, as well as the auctioning of rare tipples, kicks off at 6:30 p.m. with — what else — a see-and-be-seen cocktail reception held on the picturesque Mount Vernon lawn.

Heitkamp’s selection, and Kempthorne’s for that matter, is a bit of a break from the norm for GWSS, which tends to favor solons from the South. The group has tapped four members from the Kentucky delegation — Reps. John Yarmuth, a Democrat, and Harold Rogers, a Republican, were brought aboard in 2010 and 2011, respectively, while ex-Sen. Jim Bunning, a Republican, and GOP former Rep. Ron Lewis got the nods in 2003 and 2005 — and welcomed South Carolina Democrat James E. Clyburn in 2007.

The others residing above the Mason-Dixon Line to get the call include Iowa Democratic Sen. Tom Harkin (2008) and ex-Nevada Democratic Rep. Shelley Berkley (2009).

Per GWSS, Heitkamp is being recognized for the work she’s done during her tenure on the advisory board of The Century Council, an organization committed to stamping out problem drinking (underage, driving-related).