Which election was more of realignment: 1968 or 1980?

[Del Tachi]

1964 and 1968 have to mostly be considered together.  Activists and elites became polarized around racial issues during the 1960s, and that trickled down to the general electorate.  New Deal issues were replaced by civil rights issues as the major political fault line, and even the term "liberalism" fell into disrepute.