Trump's Shock Strategy Works, Till It Backfires (Megan McArdle) from Bloomberg
"...his front-runner status means that he is no longer going to be immune from those traditional attacks. His support may begin to slip in the primary, as his opponents finally start doing what they long ago would have done to any other front-runner: hammering him with every bit of oppo research, and rolling out those negative ads. Even if they don’t, the Democrats certainly will. These ads will be devastating."