Kyle Forti, three other Americans and their pilot were killed when their helicopter crashed on a remote island in northwest Kenya.
The midterm elections were "a brand rejection" for the Colorado Republican Party.
The Colorado 4th Congressional District representative will return to Congress as a member of minority party for the first time.
Research director Stephen Hawkins, of the nonprofit More In Common, details lesser-known political "tribes" in his study, "Hidden Tribes."
The congressman faces four challengers in the Republican primary for the uber-conservative district's seat.