Dennie Oxley, a State Representative in Indiana, is running as the Democratic candidate for that state’s Lieutenant Governor position. But that is not the news pertinent here; several articles mention that he sang in a Southern Gospel quartet for several years. The Gubernatorial candidate, a former Clinton administration official, brought him on the ticket to provide ideological and geographic balance.
No website I can find stated which quartet(s) he was part of, but as they are not listed in his career history, I think it is safe to assume that it was probably with a regional group.
Note: I see David Bruce Murray also has the story, but he misidentifies Oxley as a Republican.