Two Reasons Not to Dismiss Donald Trump

Gerald Seib: “Mr. Trump is important for two reasons: first for the damage he can do to the Republican Party, and second for the useful lesson he can teach that same party. The potential damage comes largely in the harm he can do—indeed, already may have done—to Republicans’ crucial mission of building better bridges to Hispanics. The lesson comes by way of illustrating the depths of populist anger running through sectors of the GOP right now.”