Back in 2020, global pop star Taylor Swift publicly endorsed the Biden-Harris ticket for the White House, posting a sweet photo of herself in overalls holding a plate of cookies with their names written in blue icing.

That October, she told her 250 million Instagram followers she was going to be watching the vice presidential debate between Republican Mike Pence and Kamala Harris, then a California senator.

“Gonna be watching and supporting @kamalaharris by yelling at the tv a lot,” she wrote.

The global Swiftie fanbase is now asking whether she’s going to be supporting Harris again, this time as the presumptive Democrat presidential nominee after President Joe Biden announced he was out of the race.

They have even formed a Swifties for Harris account on X and Instagram urging fans to “help get Democratic candidates elected up & down the ballot!”.

US actor George Clooney was the first Hollywood heavyweight to publicly call on Biden to pull out of the US presidential race, writing a strongly-worded opinion piece for The New York Times two weeks ago.

“We are not going to win in November with this President,” he warned.

Clooney, 63, voiced what a growing number of Hollywood supporters, donors and Congress members and senators were thinking privately, that to win the White House in November they would need a new nominee.

“There’s new excitement – Hollywood celebrities are lining up behind Kamala as if she were the second coming,” Donald Critchlow, a political history professor and director of Arizona State University’s Centre for American Institutions, told The Hill.

A California native, Harris, 59, not only received supportive statements via social media from movie star A-listers, but from Beyoncé, who also endorsed the Biden-Harris ticket in 2020.

CNN exclusively reported she gave Harris permission to use her anthem Freedom as a campaign song, although she has not yet made an official endorsement.

As of July 24, neither has Swift.

Mark Hamill (Star Wars‘ Luke Skywalker), legendary A Star is Born singer and actor Barbra Streisand, and much-loved TV show celebs including Wonder Woman‘s Lynda Carter and Seinfeld’s Julia Louis Dreyfus went public.

As did Shonda Rhimes, Jessica Alba, Cher, Spike Lee, Viola Davis, Amy Schumer and Kerry Washington.

The cool Met Gala and international fashion week regulars stepped up, with Cardi B saying she always thought Harris “was supposed to be the 2024 candidate”.

She wrote: “Stop fckin playing with me!!”.

Rapper Lil Nas X simply wrote “Lock in lil bro @KamalaHarris!”

She also got the attention of the TikTok generation, after UK pop star Charli XCX’s “Kamala IS brat” tweet ignited a social media frenzy.

Gun control activist David Hogg asked Swift directly on social media: “Have you decided who you are supporting? We need to do a ton to bring back the youth vote and you could literally be the reason we don’t fall to a pro-life, pro-gun, anti climate, felon”.

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Last month, US talk show and Oscars host Jimmy Kimmel moderated a star-studded campaign fundraiser in Los Angeles for Biden, who was joined by former president Barack Obama.

Clooney and his often-cast co-star Julia Roberts (Ticket to Paradise) were among the supporters, as was Streisand, Kung Fu Panda‘s Jack Black, Sheryl Lee Ralph from Abbott Elementary, Kathryn Hahn (Bad Moms) and Ozark‘s Jason Bateman.

The night delivered a $US30 million ($45 million) windfall for the campaign.

But then came Biden’s disastrous debate with Trump at CNN headquarters on June 28, where a stumbling performance by Biden sparked a fresh round of calls for the Democrat to consider stepping aside as the party’s nominee.

At a press conference in early July, he referred to his vice-president as “Vice-President Trump” and came just hours after he introduced Ukrainian President Volodymyr Zelensky as “President Putin” at the NATO summit.

Clooney led the charge and dropped his support.

“It’s devastating to say it, but the Joe Biden I was with three weeks ago at the fundraiser was not the Joe ‘big F-ing deal’ Biden of 2010,” Clooney wrote in NYT.

“He wasn’t even the Joe Biden of 2020. He was the same man we all witnessed at the debate.

“Was he tired? Yes. A cold? Maybe. But our party leaders need to stop telling us that 51 million people didn’t see what we just saw.”

He said Democrats were “so terrified” by the prospect of a second Trump presidency that they were ignoring all the warning signs.

“I don’t think they had any choice in endorsing Harris after raising money for Biden and then stabbing him in the back by joining an orchestrated campaign to force him out of the race,” said Critchlow, who wrote, When Hollywood Was Right: How Movie Stars, Studio Moguls, and Big Business Remade American Politics.

“They have to put their money where their mouths are.”

Kamala Harris and her two grand nieces order meet America’s Next Top Model host Tyra Banks at Smize & Dream Ice Cream in Washington, DC. Photo: Getty

In the days since Harris’ nomination, CNN spoke to several  celebrity publicists and campaign staffers who said their phones were “blowing up”.

“Usually I’m asking my clients [to participate in politics],” said one publicist.

“Nobody had to ask. People were like, ‘What do I do, and how do I help?’