You knew that an NPR list would never include "The Man in the High Castle."
Other Ommisions
Poul Anderson Guardians of Time
L Sprague deCamp Lest Darkness Falls
Mary Gentle Ash: A Secret History
Newt Gingrich & William R. Forstchen 1945
Werner KlempererFatherland
Ward Moore Bring the Jubilee
Keith Roberts Pavane
James Thurber If Grant had been drinking at Appomattox
and most of Harry Turtledove
Conclusions: Progressives to not like Alternate History, it troubles their vision of a shiny inevitable fuyure.