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New polling showing Democrats defending their U.S. Senate seats in battleground states taking commanding leads is evidence that Vice President Kamala Harris presidential bid has been a boon for her party.

That is the opinion of Democratic pollster Fernand Amandi, who appeared on MSNBC's "Morning Joe" on Thursday to explain the impact Harris has had in the few weeks since she replaced President Joe Biden at the top of the 2024 ticket.

After sharing polling data from the Cook Political Report showing Senate Democrats in Arizona, Michigan, Nevada, Pennsylvania, and Wisconsin seeing their leads jump up an additional 4 to 11 percent, co-host Mika Brzezinski was told by a laughing Amandi, "Well, Mika, it looks like, by all accounts, Christmas has come in August for the Democrats."

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"These are extraordinary polls with remarkable movement and absolutely it can be attributed to the new energy, the new momentum that has come in the direct aftermath of the change of the ticket now with Kamala Harris on top for Democrats," he explained. "This is a game changer, Mika, because what it also does is it changes completely the dynamics of the race."

"With polls like this, with these leads outside the margin of error as you touched on, it now means that money gushers of fundraising support are going to flow into these states as these races now look more solid for Democrats," he added.

"Then there's the extrapolatory effect of that helping the presidential campaigns there" he continued. "So if you are the Republicans right now, you are extraordinarily worried because A) now it looks like you may not be able to flip the Senate and B) if this is happening in these battleground states it looks like the path to 270 [electoral votes] is getting wider and stronger and clearer for Kamala Harris."

"That's really good news for Democrats, obviously doomsday for Republicans," he added.

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As former President Donald Trump's campaign continues to struggle amid Vice President Kamala Harris's surge in the polls, many political observers have been wondering if campaign bosses Chris LaCivita and Susie Wiles are on borrowed time.

During an appearance on MSNBC's "Morning Joe" on Thursday, Guardian reporter Hugo Lowell confirmed that LaCivita and Wiles appear to be on thin ice.

Donald Trump is reminding voters why they kicked him out of office in 2020 as he tries to regain the momentum he lost when Kamala Harris entered the race, according to a Democratic strategist.

Republicans have been publicly pleading with Trump to stick to policy as he campaigns against the vice president instead of making personal attacks about her intelligence that many voters find offensive, but longtime Democratic activist Brad Woodhouse told CNN the former president doesn't operate like that.

Donald Trump has lost his mojo, according to a longtime conservative critic, and that has put his campaign in a death spiral.

The former president has seemed off balance and less sure of himself since Kamala Harris took over the Democratic presidential campaign from Joe Biden, and former George W. Bush speechwriter Peter Wehner told CNN that this newly diminished Trump can't deal with the vice president's success.

Reacting to Donald Trump's speech in North Carolina on Wednesday that was billed as a town hall focused on the economy but devolved into a stream of personal attacks on Vice President Kamala Harris, MSNBC contributor Mike Barnicle suggested the former president is headed for a big fall.

On Thursday morning's edition of "Morning Joe," co-host Mika Brzezinski shared clips of Trump's rants that started with him admitting that he was supposed to be talking about the U.S. economy under President Joe Biden but then veered into him calling Harris "not smart," a "crazy person," and a "disaster."

Co-Host Wille Geist contributed, "As you listen to that speech, with that American carnage tone, reminds me of the line that [Democratic Pennsylvania Governor] Josh Shapiro said, which I won't repeat here, 'Hey, man, stop S-talking America. Why do you hold this country in such low regard?"'

ALSO READ: Trump's insatiable ego is destroying the former president

With Geist adding the "Contrast is really stark and it's a contrast that the Harris campaign likes to see," Barnicle remarked, "The campaign is yesterday versus tomorrow. I mean, we just saw yesterday. We saw a man standing there on the stage saying we are literally a third world country. I don't know anyone who believes we are literally a third world country."

After adding he thinks Trump's campaign managers "seem to have lost control of their candidate," he continued, "When it comes to the debate with Kamala, you wonder how long will it be before he really goes out of control. And I think what's going to happen is when that debate occurs, he's in the ring with the vice president of the United States, a woman, a very sophisticated, very intelligent woman, and she hammers him like a prosecutor and doesn't let him off the hook, he will go — I can't say it — but something will snap in him and that will be it."

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A pair of MAGA candidates could cost Donald Trump two key states he'll likely need to win the presidential election.

Alyssa Farah Griffin, who served as White House director of strategic communications during Trump's last year in office, told CNN Wednesday night that two far-right candidates he endorsed – Arizona Senate candidate Kari Lake and North Carolina gubernatorial candidate Mark Robinson – could pull Republican votes away from the former president.