But Trump has done nothing but upend conventional wisdom in this election—something that gives many Democrats pause. He has consistently expanded the electorate. Republican primary turnout was up 110 percent in Virginia from 2008, 63 percent in Tennessee, 57 percent in Vermont and more than 25 percent in Massachusetts, Georgia, Oklahoma and Alabama, according to Edison research. By comparison, Democratic turnout was down 40 percent in Tennessee, 32 percent in Georgia and by double digits in Alabama, Oklahoma, Virginia and Vermont.

And Trump’s unpredictability has enabled him to captivate news cycles in ways never seen in politics. Relatively speaking, he’s hardly had to spend any money on campaign ads because he gets so much free news coverage. “What I’ve been concerned about his ability to dominate the news cycle and shape it,” says David Brock, who runs several outside PACs supporting Clinton. “He is totally on offense 24/7. His ability to do that is of some concern.”

The Clinton campaign says they are taking Trump very seriously from the get go—they won’t underestimate him the way the Republican field did. They’re looking to see if he expands or changes the electorate from traditional blue states and red states, according to campaign officials. And they have decided to draw the sharpest contrast possible: Clinton will remain unrelentingly positive—think Ronald Reagan’s “Morning in America”—while leaving the attacks on Trump to surrogates, including her husband, according to Clinton campaign sources. Clinton, to borrow a phrase from George W. Bush, will be “a uniter, not a divider.”