Time

The soundtrack suggested a Beyoncé concert. The light-up bracelets evoked the Eras Tour. And the exuberant crowd—more than 14,000 strong, lining up in the rain—resembled the early days of Barack Obama. Inside a Philadelphia arena on Aug. 6, Vice President Kamala Harris was greeted with a kind of reception a Democratic presidential candidate hasn’t gotten in years. Fans packed into overflow spaces, waving homemade signs made of glitter and glue as drumlines roared. When Harris introduced her new running mate, Minnesota Governor Tim Walz, the cheering lasted more than a minute.

If you’d predicted this scene a month ago to anyone following the race, they would never have believed you. But Harris has pulled off the swiftest vibe shift in modern political history. A contest that revolved around the cognitive decline of a geriatric President has been transformed: Joe Biden is out, Harris is in, and a second Donald Trump presidency no longer seems inevitable. Democrats resigned to a “grim death march” toward certain defeat, as one national organizer put it, felt their gloom replaced by a jolt of hope. Harris smashed fundraising records, raking in $310 million in July. She packed stadiums and dominated TikTok, offering a fresh message focused on the future over the past. Volunteers signed up in droves. Trump’s widening leads across the battleground states evaporated. Over the span of a few weeks in late July and early August, Harris became a political phenomenon. “Our campaign is not just a fight against Donald Trump,” she told the cheering crowd in Philadelphia. “Our campaign is a fight for the future.”