His Union Party was a coalition of anti-Roosevelt groups, so obviously yes.
...with socialist rhetoric. Lemke was really a stand-in candidate for the dead Huey Long. Although he was a Republican congressman (and actually was reelected as a Republican congressman in 1936).
He took votes from populist Republicans, who wanted reform but hated FDR. Look at where he got his strongest support... it wasn't in Democratic areas. Also, his isolationist rhetoric held strong appeal for conservatives.
Remember, Landon wasn't a Coolidge Republican- he was a moderate who supported much of the New Deal. It wouldn't have been a stretch for the Townsend/Coughlin/Smith types to support him over a man they hated.