Donald Trump marked 100 days on top of the polls Wednesday, exceeding 30 percent nationally in an ABC News/Washington Post poll. We're about as many days away from the Iowa caucuses.

After months of treating the Trump juggernaut as a joke or a dream from which they will soon awake, leading Republicans are starting to prepare for the possibility he will win.

Another poll for ABC News and the Washington Post found that 42 percent of Republicans think Trump will be the nominee. An unlikely coalition of establishment Republicans and movement conservatives is beginning to panic about the possibility of him coming away from the Cleveland convention a winner.

Trump doesn't just lead in the national polls. He leads in Iowa, New Hampshire, South Carolina, Florida and Nevada, the first five states where people actually vote.

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