With Hillary Clinton’s multiple misdeeds coming to light and causing her political problems, reflected in her declining support in the polls, both she and the Democratic party have reason to be concerned. But both of them may yet be rescued by “The Donald,” who can turn out to be their Trump card. Donald Trump has virtually no chance of becoming even the Republican party’s candidate in 2016, much less being elected President of the United States. The reason is not hard to understand: Republican voters simply do not trust him, as the polls show. Nor is there any reason why...