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Within minutes of Joe Biden dropping out, the wheels were already in motion in both the Democratic and Republican parties.
All of it centered on one person: Vice President Kamala Harris, Biden's endorsed heir apparent.
Shortly after Joe Biden made his stunning announcement on Sunday that he was bowing out of the race, the president endorsed Harris to replace him at the top of the ticket.
Top Democrats were ready to lend her their support.
Just about 20 minutes after Biden announced he was dropping out, and minutes before the president endorsed Harris, Democratic Colorado Gov. Jared Polis appeared to endorse Harris in a post on X containing just three emojis: a coconut, a palm tree, and an American flag — a reference to the pro-Harris memes that have flooded the internet in recent weeks.
Other top Democrats — including Bill and Hillary Clinton, the Chairs of both the Congressional Black Caucus and the Congressional Progressive Caucus, and Senator Elizabeth Warren — followed suit soon after to voice their support for Harris.
One of her most notable backers was Rep. Jim Clyburn, the influential South Carolina lawmaker whose endorsement of Joe Biden in 2020 elevated his candidacy at a crucial time.
"I echo the good judgment he demonstrated in selecting Vice President Harris to lead this nation alongside him, and I am proud to follow his lead in support of her candidacy to succeed him as the Democratic Party's 2024 nominee for President," Clyburn wrote on Sunday.
And Harris herself was waiting in the wings, announcing that she was throwing her hat in the ring.
"I am honored to have the president's endorsement, and my intention is to earn and win this nomination," Harris said in a statement issued through Biden's campaign. "Over the past year, I have traveled across the country, talking with Americans about the clear choice in this momentous election. And that is what I will continue to do in the days and weeks ahead."
By 5 p.m., Biden's campaign committee had filed notice with the Federal Election Commission: it was changing its name from "Biden for President" to "Harris for President."
Harris will still need to win the nomination at the Democrats' convention next month, but top rivals are already ducking out of the race, clearing the way for her to take over the ticket, CBS News reported.
Republicans were also prepared for Harris — and they didn't waste any time launching attacks against her.
The Trump campaign released a statement on Sunday criticizing Biden and Harris as Trump himself focused on mocking Biden.
"Kamala Harris is just as much of joke as Biden is," the Trump campaign's statement said. "Harris will be even WORSE for the people of our Nation than Joe Biden. Harris has been the Enabler in Chief for Crooked Joe this entire time. They own each other's records, and there is no distance between the two. Harris must defend the failed Biden Administration AND her liberal, weak-on-crime record in CA."
And Trump's allies were also ready with two attack ads on Harris, one of which went live within an hour of Biden dropping out.
The ads focused on her record as a California prosecutor and tied her to the GOP's attacks on Biden's border policies and criticism of Biden's age, alleging that she was part of a cover-up to hide his struggles.
House Speaker Mike Johnson joined in on the Republican criticisms of Harris, writing on X that, "As second in command and a completely inept border czar, Harris has been a gleeful accomplice — not only in the destruction of American sovereignty, security, and prosperity, but also in the largest political coverup in U.S. history."
But just because Republicans were ready for the possibility that Harris could be the nominee doesn't mean they wanted it to happen.
Biden's flailing campaign had been working well for Trump, who was consistently polling ahead of Biden in both national polls and swing state polls.
Before Biden's bombshell announcement, people familiar with the Trump campaign told The Guardian that Trump and his team wanted Biden to remain the nominee.
And the Trump team had even started dialing down their attacks on Biden in recent weeks in the hopes that he'd stay in the race, The New York Times reported.
Instead, the attacks turned out to be too strong.
Rather than weaken Biden for a 2024 rematch, Trump's campaign dealt him a knockout blow and Democrats pushed him out of the race.
Recent polling suggests Harris may not be as easy an opponent. Now Republicans will have to hope that their attacks on Harris will be as effective as their assault on Biden.