"Blacks clearly didn't switch for reasons of race because the Democratic Party was, in the 1930s, the undisputed home of racism. It remained so until at least the early 1960s. (I say "at least" because I believe that modern progressive Democratic ideology remains infused with racism, although this racism manifests itself in a new way.) So many blacks switched reluctantly, because they knew they were leaving the party of Lincoln for the party of segregation, lynching, and the Ku Klux Klan."