When a political party picks one candidate over another, the party signals to the broader electorate what it represents. If the Republican Party nominates Ted Cruz instead of Donald Trump, it will represent one of the greatest practical and moral victories in the Republican Party’s noble history. Cruz’s enormous victory in Wisconsin this week makes it more probable than not that Donald Trump falls short of the required 1,237 delegates – 50 percent plus one of the 2,472 total delegates to the convention – to cinch the nomination on the first ballot. Combined with savvy delegate recruitment and a mounting...