SAN DIEGO — In Alpine, Calif., a suburban Southern California enclave, Duncan Hunter was a good neighbor. He’d help people do yard work, or move heavy furniture. He drove the same dented-up truck for years. At parties, he’d have a beer, two tops, and he might go off and sneak a cigarette so his wife wouldn’t see. He rarely talked about his job as a congressman.

In Washington, Mr. Hunter was a fixture on the bar scene, and spent lavishly — over $400 for 30 tequila shots at a bachelor party, and countless fancy dinners. He visited one of his favorite bars sometimes multiple times a day, piling up thousands of dollars in tabs. On occasion, he would get into loud arguments with patrons, once over the choice of music on the jukebox (he hated Celine Dion).

[Duncan Hunter’s most recent campaign ad suggests his opponent is a terrorist sympathizer. Read more about it here.]

Those divergent lives — between the watering holes and halls of power in Washington and the suburban tracts and chain stores of Southern California — intersected for years, prosecutors say, as Mr. Hunter and his wife funded their personal lives with campaign donations, the dimensions of which were revealed in an indictment last week.