It’s a time-honored ritual: At the start of every presidential election cycle, voters in the early primary states are treated to soft-focus biographical ads about the presidential contenders, their small-town upbringings, their homespun values, their love for America. The ads grow nastier through the fall and winter until all of a sudden, nominees emerge and we get thrown back to the beginning: another round of those same soaring biographical spots, reintroducing the two remaining contenders to America in the most flattering of ways, as though voters spent the past year with cotton balls in their ears.

Hillary Clinton is holding up her end of this tradition. On Thursday, her campaign released three positive ads in the key swing states of Colorado, Florida, Iowa, Nevada, New Hampshire, North Carolina, Ohio, and Virginia. The TV spots—which show Clinton walking unsteadily as a toddler, sauntering through Congress, and jetting around the world on Air Force One—are tailored to remind voters why they liked her in the first place, to smooth over the divisions in her party, and to refocus voters on what matters: keeping the White House in Democratic hands. Safe hands. Not Donald Trump’s hands.

“Raised in a spacious Tudor Revival house in Jamaica Estates just outside Manhattan. Taught by his father about business, about thriftiness, about using his sizable inheritance to make billions.”

Trump, breaking with yet another traditional campaign practice, has thus far shown no inclination to launch an ad blitz to reintroduce himself to voters—even though he desperately needs one to improve his abysmal public persona. Hillary Clinton has risen recently to 55 percent favorability in some polls, while Trump’s numbers have nose-dived in recent weeks. A whopping 70 percent of Americans now have an unfavorable opinion of him, up ten points in the last month alone. He needs to stop the bleeding, and positive ads would theoretically help accomplish that. So what’s holding him back?

Well, maybe it’s this: Try, just try, to imagine Donald Trump re-introducing himself as relatable-yet-inspirational to Americans. Would he concoct a story about his heroism, John McCain-style? Spin stories about his hardscrabble youth, Barack Obama-style? Cast himself as a proven world leader, Hillary Clinton-style?

Those three candidates’ first general-election commercials were all designed to reset their political images after tough primary battles, and together, the spots represent the three main archetypes of the successful general-election kickoff ad. But while most politicians turn to one of these themes to introduce themselves to voters, Trump will find it a little harder to do so. Let’s look back on these recent classics of the genre, and ponder the possibilities of Trumpian adaptations.