Which election was more of realignment: 1968 or 1980?

[Beet]

The New Deal Coalition is kind of like the Roman Empire of American politics. When did it finally end? You can say anywhere from 1948 with Humphrey's "Sunshine of Human Rights" speech and the Dixiecrat revolt, all the way to the defeat of Mary Landrieu in 2014. But electorally, I'd agree that 1968 was more important than 1980.