CommanderSock CommanderSock:
However, I don't believe the democrats had any major movements to expel black members from the party like the Republicans did.
I'd argue that this didn't occur because the Democrat Party specifically had few black members until more recently. Like Bart showed. The Democrats specifically voted against Lincoln, and after Reconstruction, Democrats took over most state legislatures upon their reentry into the union.
It's only until recently, and most likely due to social welfare/economic considerations, is why minorities have moved from voting for Republican to voting for Democrats. Why would the Democrats attempt to purge minorities when they consist of one of their major voting blocs?