McKinley (sane; not a bigot or a radical).
Definitely Bryan. This country would be much better off today if he was elected then.
I find it odd how Democrats pick and choose which of their segregation enablers they disown (Wallace, A Johnson, Eastland, etc.) and which ones they look back fondly upon (Bryan, JFK, Jackson, etc.). Seems to have a direct correlation with how well historians remember them, which reeks of revisionist history given that they all championed the same economic populism...
Don't forget Huey Long and LBJ.