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Republicans are scrambling to regain their footing after President Joe Biden dropped his re-election campaign and threw his support behind Vice President Kamala Harris.

The 81-year-old president ended his campaign Sunday following weeks of mounting pressure from other Democrats over concerns about his age, and Barack Obama's former campaign manager David Plouffe told MSNBC's "Morning Joe" that Donald Trump and his GOP allies were left grasping at straws following the shakeup.

"I've been impressed by Kamala's interviews the last few weeks," Plouffe said. "She's a prosecutor, he's a criminal – I like the matchup.

"Listen, let's not forget, the biggest issue in this campaign was Joe Biden's age. If Donald Trump gets elected, he'll be older than Joe Biden [was] on Inauguration Day. This guy is showing serious signs of unfitness — yes, in terms of character and the positions he holds, but in terms of his decline. He is really, really having trouble reading the Teleprompter. Obviously, the [Republican National Convention] speech was bad in tone, but he couldn't follow instructions there. This should give us great pause."

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The former president had been counting on a rematch with his 2020 rival, and although his team has been preparing for the possibility that Biden would drop out, Plouffe made fun of Trump adviser Jason Miller for coming out of the chute by attacking Harris for supporting a ban on plastic straws for environmental reasons.

"I'm excited about this," Plouffe said. "I think the Trump campaign doesn't seem like they were as prepared for this switch as perhaps they might have been. They seem like they're kind of grasping. I guess they're talking about plastic straws and whatnot – not a compelling message."

Watch the video below or at this link.

MSNBC 07 22 2024 07 17 29 youtu.be

Vice President Kamala Harris delivered a speech before an enthusiastic crowd in Milwaukee on Tuesday that earned plaudits from many progressive political observers — as well as relief about the contrast she delivers between herself and both President Joe Biden and former President Donald Trump.

Harris, who was endorsed by Biden on Sunday after he announced that he would be dropping out of the 2024 race, delivered a fiery address that touched on themes ranging from voting rights to reproductive freedoms to gun safety.

Writing on Twitter, many progressives took immediate note of the jolt of energy she had injected into the campaign.

"Elections are about all kinds of things, but I think a happy person talking about the future fits the moment better than an angry old man yelling about the past," argued Slate columnist Zachary Carter.

Watching Kamala Harris speaking in Wisconsin... By hell she’s impressive," wrote British broadcaster and media personality Carol Vorderman. "And she’s going to win … she’s energizing the young voters and has no fear of the fight."

RELATED: Harris leads Trump in first poll taken since Biden quit

NYU Law professor Chris Sprigman, meanwhile, praised Harris for delivering "a smiling, warm, positive affect, combined with coherent, declarative sentences in plain English."

"The election is going to be hard-fought," he added. "But God what a relief."

"So glad Harris is going with a future-focused message against Trump," commented Pod Save America host Tommy Vietor. "That's been missing to date imo. This is a Janet Jackson election: what have you done for me lately?"

Political reporters who watched the event also took notice of the new energy delivered by Harris.

"Hard to overstate how hyped the crowd is," wrote Politico Playbook's Eugene Daniels. "Very different vibe than usual."

"The contrast between Harris's speech and the speeches we've been hearing Biden give all year was striking," wrote New York Times reporter Peter Baker. "At none of the Biden speeches I've covered lately was the case made against the other side this sharply defined and delivered nor has there been this kind of energy."