The new dynamic has come into focus this week as Trump's opponents debut strategies for engaging the white-hot front-runner whom they believe, and in some cases fear, could be a dominant force for some time to come.

Though flummoxed by Trump's staying power and aghast at the coarse tone he has brought to the race, party elites said they have no plan to take him down. Donors feel powerless. Republican officials have little leverage. Candidates are skittish. Super PAC operatives say attack ads against him could backfire. And everyone agrees that the Trump factor in this chaotic multi-candidate field is so unpredictable that any move carries dangerous risks.

The non-Trump candidates are falling into three categories: Those who are emulating and befriending him in an effort to win over his supporters; those who are assailing his background or calling him out for his views and rhetoric; and those who prefer to stay silent, as if hunkering down in the basement to ride out the tornado.