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Taylor Swift’s influence is making waves in politics, whether Donald Trump likes it or not -- because a nonprofit organization has seen a massive recent surge in people signing up to vote using their online registration tool.

Celina Stewart, CEO of the League of Women Voters, tells TMZ that in the past two days -- which includes Taylor’s Kamala Harris Tuesday night endorsement -- they’ve seen a nearly 100% increase in people using the voter-registration tool on VOTE411.org, a go-to resource for all things election-related.

What’s more, Celina tells us they’ve noticed a big shift in user demographics. On Monday, the biggest age group was 55-to-65-year-olds -- but by Wednesday, the largest group was 18-to-24-year-olds.

J.D. Vance is claiming Taylor Swift's endorsement of Kamala Harris doesn’t carry much weight, because her wealth and high-profile status make her out of touch with the average voter.

In a Fox News appearance Wednesday, Donald Trump's VP pick said despite her star power, folks aren’t going to be influenced by the views of a billionaire celeb ... who he says does not experience the everyday struggles of most Americans.

Taylor signed off her Kamala IG endorsement Tuesday night with "Childless Cat Lady," which probably ruffled Vance's feathers even more.

President Biden broke necks when he put on a red MAGA hat ... but he's not switching teams -- the White House says it was in the spirit of bringing both sides of the aisle together.

POTUS was photographed Wednesday wearing a Donald Trump 2024 lid at a fire station in Shanksville, Pennsylvania ... and it quickly went viral.

White House spokesperson Andrew Bates explained the lead-up to the photo ... saying Biden was speaking about America's bipartisan unity after 9/11 and the need to return to that strength, when he gave a Trump supporter a hat to wear ... and was then given a MAGA hat in exchange.

Taylor Swift isn't the only pop star publicly endorsing Kamala Harris ... Katy Perry stepped out in some merch supporting the Vice President's presidential run Wednesday.

Hours after Taylor Swift announced her endorsement of Harris and Tim Walz's campaign for the White House, the fellow singer stepped out in Manhattan wearing a camo-patterned Harris-Walz hat.

While it's no secret that Katy leans liberal -- she previously shared a video compilation of Harris highlights set to her hit "Woman's World" this summer -- her outing makes it clear she's all in on supporting the Harris-Walz ticket.

Donald Trump amplified one standout, insane conspiracy theory during Tuesday night's presidential debate -- suggesting Haitian immigrants are eating pets in Ohio. And the fact is, there IS one horrifying cat case, but the facts don't match Trump's.

Here's the deal ... over the weekend, J.D. Vance stoked a looney notion that Haitian immigrants are killing and eating random pets in Springfield, Ohio ... which was swiftly debunked. Nevertheless, rabid supporters ran with the narrative.

Then, during the debate ... DJT raised the fantastical story again, which was subsequently supported by Trump supporter Kevin Sorbo, who posted a police body cam video of an Ohio woman being arrested for alleged animal abuse last month.

Taylor Swift’s endorsement of Kamala Harris is more valuable than any financial donation, says a former Tennessee congressman who’s seen Swift's star power work wonders for his own campaign.

Jim Cooper, who Swift endorsed for the U.S. House of Representatives back in 2018, tells TMZ ... though the star didn’t contribute cash to his campaign, her endorsement was more than worth its weight in gold.

He says it was a massive boost for his election, so he’s confident Kamala will appreciate the push just as much.

Donald Trump is convinced he won Tuesday night's presidential debate against Kamala Harris ... but he's accusing the network that hosted the event of bias.

The former prez called into "Fox & Friends" Wednesday morning, where he ripped into ABC News for holding, what he called, a "rigged" debate.

Check out the vid ... Trump slammed the ABC network for being "dishonest" after debate moderators chose not to correct Harris over one remark -- specifically, Trump took issue with Harris villainizing his use of the phrase "bloodbath," claiming he was referring to the economy -- not endorsing rioting.

Donald Trump and Kamala Harris aren't letting last night's debate jabs get in the way of commemorating lives lost on 9/11 ... the presidential hopefuls kept their composure during Wednesday's memorial ceremony.

Mere hours after 45 and the current Vice President were at each other's throats debating on ABC News, the 2 politicians stepped out for a memorial service at Ground Zero in NYC ... where they honored the nearly 3,000 people who died there in a terrorist attack 23 years ago.

The candidates made it clear the 9/11 tribute is no place for politics ... choosing to keep it civil and share a handshake while posing for pictures.

George Conway’s joining the chorus of folks declaring their take on who won the Kamala Harris - Donald Trump debate last night.

We caught up with the conservative lawyer and anti-Trumper as he left 'Jimmy Kimmel' Tuesday ... offering his opinion on the outcome, and calling out Trump’s bizarre migrants-eating-pets claims.

Conway also comments on Taylor Swift’s endorsement after the debate -- declaring he’s got daughters who are total Swifties.

Donald Trump has some "Bad Blood" with Taylor Swift following her decision to endorse Vice President Kamala Harris ... and he made his feelings on the matter abundantly clear.

The former prez called into "Fox & Friends" after the debate and Swift's highly-publicized endorsement ... and while 45 tried to seem calm and cool about the whole thing, he was a bit miffed by her decision.

As Trump put it ... He didn't even want Swift's endorsement to begin with, since he wasn't even a "Taylor Swift fan."

Kamala Harris just won the grand prize in her debate with Donald Trump ... because the TV showdown netted the Vice President a crucial endorsement ... from the one and only Taylor Swift.

The singer just announced she's voting for Harris and running mate Tim Walz ... making her allegiances known only minutes after Harris and Trump wrapped their first debate.

Taylor says she watched the debate and recently became aware of her fake AI endorsement of Trump ... so she wanted to be transparent about her plans for the upcoming election.

Donald Trump pushed a wild conspiracy theory about Haitian immigrants eating American pets during Tuesday's debate – prompting Kamala Harris to bust out in laughter onstage.

Trump delivered his bizarre response after ABC News moderator David Muir asked the Republican presidential nominee about why he killed a bill in Congress that would have secured the southern border.

DT began by responding to a previous statement by Kamala about people leaving Trump's rallies early because they're tired of his shtick.

Kamala Harris and Donald Trump are getting personal on the debate stage ... and the fireworks really started when she turned the attention to his campaign rallies.

Vice President Harris went below the belt about half an hour into their first presidential debate Tuesday, ripping Trump's rallies as an exercise in fantasy.

Harris says Trump rallies are a sight to see because he spews pure fiction ... referencing Trump talking about "the late, great Hannibal Lecter" ... and she says even his supporters hit the exits early because they get bored with his spiel.

Donald Trump just can't get over President Biden ... repeatedly attacking him on the debate stage ... even though his opponent is Kamala Harris.

The former president ripped Biden several times during Tuesday's debate against Vice President Harris in Philadelphia, saying Biden's been so absent in the Ukraine war he wonders if POTUS is even alive.

Trump said Democrats threw Biden out of the race "like a dog" after a poor showing in a June debate against Trump ... and he says Biden's since spent his days sleeping or chilling at the beach.

Megyn Kelly is not angling to be "Friends" with Jennifer Aniston ... taking shots at the actress for her recent criticism of J.D. Vance, implying she's a fake feminist.

The newswoman came after the star's political views in a sit-down with Shawn Ryan on his 'Eponymous' podcast ... where she criticized Aniston for pretending to care about women's issues.

As Megyn put it ... Jennifer only spoke out after the VP hopeful's comments about "childless cat ladies" fueled controversy -- but has remained noticeably silent regarding several other topics.

Melania Trump says the silence around Thomas Matthew Crooks' attempt on her husband Donald Trump's life feels "heavy" ... and she's questioning the circumstances.

In a new X video Tuesday, the former First Lady says her husband's near-death ordeal in July was distressing ... and she’s puzzled why cops didn’t arrest the shooter before Donald’s rally speech, where Crooks nicked his ear with a bullet.

Melania says there's more to the story, and she wants to "uncover the truth" in the brief video ... which promotes her new memoir, "Melania."