Malzberg, Barry N. "Kingfish"
Divergence: 1935 CE
What if: Huey Long survived the assassination attempt in 1935 and became president in 1936 by stealing away FDR's vice-president.
Summary: John Nance Gardner tells how he struck a deal with the Kingfish, and then how they dealt with Hitler.
Published: In Alternate Presidents (ed. Mike Resnick), q.v.