Cliff: There is one! It’s the townhouse where Hart was busted. When I’m giving tours of DC to political junkies, I always make sure to include it. Here’s a picture. And here’s an extract from a Wash Post scandal-tour guide:

517 6th St. SE — The Gary Hart House
Rumors of Gary Hart’s philandering ways circulated for months leading up to his presidential candidacy in 1987. He threw down the gauntlet, challenging reporters to follow him around and claiming that there was nothing to see. Much to his chagrin, the Miami Herald took him up on it, sending reporters to stake out his Capitol Hill townhouse. Donna Rice came to visit one fateful Friday night in May and didn’t leave until the following evening. This news story–along with earlier photos of Hart and Rice aggressively pursuing public displays of affection on a friend’s yacht, “Monkey Business”–threw Hart’s campaign into a tailspin. Three weeks into his bid for the presidency as the early front-runner, Hart pulled out of the race.