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If a Trump nomination happens, it will imply that the Republican Party has been weakened and is perhaps evenon the brink of failure, unable to coordinate on a plan to stop Trump despite the existential threat he poses to it.
Major partisan realignments do happen in America — on average about once every 40 years. The last one, which involved the unwinding of the New Deal coalition between Northern and Southern Democrats, is variously dated as having occurred in 1968, 1972 and 1980. There are also a lot of false alarms, elections described as realignments that turn out not to be. This time, we really might be in the midst of one. It’s almost impossible to reconcile this year’s Republican nomination contest with anyone’s notion of “politics as usual.”
If a realignment is underway, then it poses a big empirical challenge. Presidential elections already suffer from the problem of small sample sizes — one reason a lot of people, certainly including us, shouldn’t have been so dismissive of Trump’s chances early on. Elections held in the midst of political realignments are even rarer, however. The rules of the old regime — the American political party system circa 1980 through 2012 — might not apply in the new one. And yet, it’s those elections that inform both the conventional wisdom and statistical models of American political behavior.
This doesn’t necessarily mean we’ll be completely in the dark. For one thing, the polls — although there’s reason to be concerned about their condition in the long-term — have been reasonably accurate so far in the primaries. And some of the old rules will still apply. It’s probably fair to guess that Pennsylvania and Ohio will vote similarly, for example.
Still, one should be careful about one’s assumptions. For instance, the assumption that the parties will rally behind their respective nominees may or may not be reliable. True, recent elections have had very little voting across party lines: 93 percent of Republicans who voted in 2012 supported Romney, for example, despite complaints from the base that he was insufficiently conservative. And in November 2008, some 89 percent of Democrats who voted supported Barack Obama after his long battle with Hillary Clinton.
