So where do traditional Republicans, movement conservatives and the party's big-money donors go now? There are no obvious choices. Surely, most will eventually climb on board the Trump campaign jet as Governor Christie and a few others have already done. They will grin and bear Mr. Trump's criticisms of the Iraq War under George W. Bush or perhaps his racist rants about Mexicans or Muslims. Some are likely to stay home while others might seek out a third party candidate. In any event, the chief beneficiary of all this splintering of the Republican Party looks likely to be Hillary Clinton, the Democrats' ultimate insider candidate who had an even bigger day on Super Tuesday than Mr. Trump, capturing seven of eleven states (including the biggest one, Texas) and looking dominant in the South. Sen. Bernie Sanders wasn't shut out, of course, but the delegate count now has the Vermont senator losing by nearly a 3-1 ratio.