 The Republican Party once pursued electoral power in service to solutions for such problems, to building a shining city on a hill, as Ronald Reagan liked to say. Its vision of the United States, embodied in principled public servants like George H.W. Bush, John McCain, and Mitt Romney, was rooted in values of freedom, sacrifice, and individual responsibility in the common good. The party's conception of those values is reflected in its long-standing conservative policy agenda. And today, many Republicans set aside their concerns about Mr. Trump because of his positions on immigration, trade, and taxes.