Coalitions today had Nixon won 1960 and push through CRA and VRA?

[David Hume]

Say Nixon won in 1960, which is very possible had he campaigned more efficiently. He pushed through a slightly moderate version of CRA an VRA, despite the objection of the Southern Dems. He still nominated strict constructionist like Warren Burger and support tough on crime policies. What would be the coalitions today?

It's very likely that the Rockefeller Republican still very influential, and the Southern Dems still Dems. In general Republicans would be more in the middle of the political spectrum, while the two ends are Northern liberal Dems and Southern Dems. Abortion would still be hotly debated, but not as partisan.

[David Hume]

Racially I guess it depends on whether and when the 1965 immigration act happens, and how partisan support for this and future immigration laws break down.

Urban-rural and educational realignment probably still happen, as I'm guessing that social and technological progress (e.g. automation) eventually make the Northern liberal wing of the Dems the dominant wing of the party.

In general Republicans would be more in the middle of the political spectrum, while the two ends are Northern liberal Dems and Southern Dems. Abortion would still be hotly debated, but not as partisan.

This doesn't sound too different from 21st-century Dems being the party of the well-off and the poor while 21st-century R's do better with middle income voters/households.

Yet the difference would be the polarization. Had the southern religious conservative been out of the GOP, either remaining in D camp or establishing a third party, the GOP would be much more moderate, with a much stronger libertarian wing.