mainstreamer

mainstream +‎ -er

mainstreamer (plural mainstreamers)

1. Someone in the mainstream.
   • 1991 February 8, Michael Miner, “Sun-Times Picks a Critic/Skip in Time”, in Chicago Reader‎:

     And what a strange souvenir it is of its time: when mainstreamers desperate to save a newspaper clung for dear life to subversive wit!

   • 2007 November 8, Peter Beinart, “Marching After Goldwater in the Opposite Direction”, in New York Times‎:

     But to Goldwater and Bozell it was the mainstreamers who were the true aliens.

See Thesaurus:mainstreamer