Is there a greater political virtue than honesty? Perhaps courage, the trait an honest man needs before he can tell the truth. I can’t say whether honesty or courage is greater, but I do know that we’ve not seen a lot of either in the debate over Donald Trump.

Anti-Trump politicians and commentators refuse to credit the president for turning the economy around. They say the tax cuts didn’t help anyone, and prefer to talk about collusion with Russian agents. With greater honesty, they would acknowledge that Americans’ bottom...