It's KPOJ today. Sports talk. Before that it was left-wing talk. Wikipedia: "The progressive talk format was replaced by sports talk at 5:30 PM on November 9, 2012, three days after the 2012 general election."

Changed formats in the middle of the day. That's chutzpah. Other history:

Among KGW's early personalities was Mel Blanc, a local musician and vocalist featured on the "Hoot Owls" variety program from 1927 to 1933. Here, Blanc discovered a talent for character voices that would win him stardom as the voice of Bugs Bunny, Daffy Duck and many other Warner Brothers cartoon features.

POJ stood for Portland Oregon Journal; no idea what KGW stood for.