A point I often make is that Donald Trump’s travails were not because of Democrats. Instead, they were because of Republicans. Had the Republicans supported him, the past seven years would have been very different. And if you doubt that Republicans are a problem, just check out how the Republicans in North Dakota’s legislature vote. When Democrat voters cast their ballots for a Democrat candidate, they know what they’re getting: Someone who will reliably vote in lockstep with Democrat party leadership, whether that leadership comes from the White House or Congress, and whose votes will invariably hew left. That’s not...