Scratch that Progressive to Liberal
Helen Gahagan Douglas
George Brown Jr
Dolores Huerta
Harvey Milk
Robert C Weaver
Glen H Taylor
Thomas B Adams
Noam Chomsky
Thomas D’Alesandro Jr
Leonard Woodcock
John Dingell
Carl Levin
Elmer Austin Benson
Frank P Graham
Henry B Gonzalez
Lyndon LaRouche LW Populist to Progressive
Mike Gravel
Karl Rolvaag
Quentin Burdick
Gus Hall
William C Bulitt Jr
Jose Mujica
Henry Howell Progressive to LW Populist
Richard W Leche
I don’t think I have any eligible conversion options or Kingmakers.