In my lifetime, no Democrat in the White House has ever appointed a Supreme Court justice who surprised the nation by becoming more conservative, while the opposite certainly cannot be said for Republican appointments. Mr. Trump might not support a constitutionalist conservative focused on original intent and limits on the court’s powers. He may be more likely to appoint Judge Judy. However, there is only a chance that a President Trump would nominate a bad justice, while Mrs. Clinton certainly would.

The current president has abused his executive powers to implement ObamaCare and to grant de facto amnesty for illegal immigrants, in defiance of Congress and the courts. The next president will make critical decisions on whether to renew these executive orders or issue new ones repealing past abuses, and will make key appointments who will decide whether to continue bending the law to prop up ObamaCare.

Repealing and replacing ObamaCare will require congressional action. But President Obama has proven how much can be done by a determined executive. I admire his tenacity, though not his goals or disregard for constitutional limits. Mr. Trump has had a decidedly mixed record of both supporting and opposing more government involvement in health care. Mrs. Clinton has been much more consistent in favor of a big-government approach, dating to her own failed efforts in the 1990s.