There’s been lots of speculation about the fate of the Republican Party if (as most of the prognosticators expect and hope) Donald Trump loses. There’s been less speculation, though recent polling suggests it may be in order, about the fate of the Democratic Party if Hillary Clinton loses.
Certainly there’s reason to think — or fear — the Republican Party will change. Republicans likely won’t supply the bulk of support for free-trade agreements as they increasingly have for 40 years. Prominent Republicans probably won’t press for mass legalization of illegal immigrants, as they did in 2006, 2007 and 2013.
If Trump loses, the Republican electorate will have become more downscale and elderly — a continuation of a process that’s been in train since the middle 1990s. The long-term migration of voters southward along Interstate 95 will have made the East Coast just about as solidly Democratic as the West Coast, leaving a Republican rump in the interior South and the Great Plains.