No I think it was 1992 when the GOP went right on the social issues. The North isn't conservative on social issues like the Deep South is. The trend wasn't as pronounced in the Upper Midwest as it was maybe still is in the Northeast. Republicans can still win Ohio and be competitive in WI for example. Dems win IL because of Cook County. MI-I think the GOP lost Oakland County because of social issues though on the Presidential Level. The County Commissioner has been the same Republican for years though.
That's all true too. I also meant by looking at the trends in the New England states throughout the 80's. It's hard to see because of how much Reagan and even Bush won by, but there's a decline in their performances from the Eisenhower-Nixon era with the exceptions of 1964 and 1968.