In retrospect, which were realigning elections?

[Orser67]

I'd actually say none. If I was going to point to a single election, I might say 1994. 1996 was sort of the last gasp of Democratic presidential strength in the South, but I think the Republican Revolution was what established our current ideologically sorted parties (though this continued until at least 2014, with the defeat of the last Southern Democratic Senators), and 1996 is at least partly attributable to a popular incumbent from the region.