GOP U.S. Senate candidate Dave McCormick is campaigning hard on the fact that his opponent, U.S. Sen. Bob Casey, supports another term for President Joe Biden.

While Casey’s position isn’t popular — a huge majority of Keystone State voters believe Biden is too old — it appeared the three-term Democrat might get a reprieve. Prominent Democrats like former House Speaker Nancy Pelosi have been working behind the scenes to push Biden out, which would let Casey off the hook.

A chorus of  Democrats and donors have called for Biden to bow out of the presidential race, fearing a Trump victory. Vermont Sen. Peter Welch was the first senator to ask Biden to withdraw for the “good of the country.” At least 20 House Democrats have called for Biden to drop out of the 2024 race.

That all changed Saturday when an assassin’s bullet narrowly missed former President Donald Trump. The Republican nominee survived, but it appears any hopes of getting Biden off the ticket didn’t.

“Everything is on pause for the moment given the gravity of the moment in time we’re in,” said Jeff Jubelirer, vice president with Bellevue Communications. “I haven’t heard any new Democrats saying anything about Biden since Saturday. It seems like this will remain on pause for at least the short term. However, I don’t know if this will change the overall calculus that many Democrats want Biden to drop out for a new candidate. I suspect the grave attack won’t change their positions.”

Jubelirer is right regarding the political math. A New York Times/Siena College poll released Monday found Biden losing Pennsylvania to Trump 48 to 45 percent. Worse, campaign professionals say, is the fact that around 60 percent of Keystone State Democrats say Biden it too old. And Democrats are split on keeping Biden on the ticket, with 48 percent sticking with Biden and 46 percent wanting him gone.

But Democrats like Casey and his colleague, Sen. John Fetterman, are backing Biden. “I refuse to join the Democratic vultures on Biden’s shoulder after the debate. No one knows more than me that a rough debate is not the sum total of the person and their record,” Fetterman said.

And it appears the national party is falling in line, too. Former Democratic National Committee chair Donna Brazile told The New York Times that after Biden’s debate fiasco, “it’s been hysteria on steroids. But now Biden’s not going anywhere.

“If he is not going to buckle under the weight of what has happened over the last two and a half weeks, I don’t know why anyone else should,” she said.

Republicans are delighted. They see Biden as a weak candidate, and Casey’s embrace of a candidate most voters believe is clearly unfit to serve.

McCormick has billboards around Pennsylvania that say “Same Old, Tired Ideas” with pictures of Casey and Biden. They went up last week in Philadelphia, Pittsburgh, Scranton, and Bloomsburg. Casey and Biden are both from Scranton, while McCormick grew up in Bloomsburg.

McCormick’s campaign launched a digital ad after the June 27 debate titled “Bob Casey Knew,” a reference to the fact that, due to his relationship with Biden and the White House, Casey had to be aware of Biden’s declining cognitive skills.

“There’s nobody in the Senate closer to Joe Biden than Bob Casey,” McCormick told DVJournal. “As a veteran, I’m worried about Biden’s ability to keep our troops safe. How can Casey, one of Biden’s closest friends in Washington, continue to ignore what’s at risk with a weak commander-in-chief? The commonwealth deserves better than their failed leadership and tired, old ideas.”

Why won’t Casey, caught in a tough re-election campaign in a state Biden is losing, cut the president loose?

“The relationship that Sen. Casey and the president enjoy transcends politics,” says longtime Democratic strategist TJ Rooney. “The president has enjoyed exceptionally close relationships with both Sen. Casey and Gov. Casey [Sen. Casey’s father]. Bob Casey is a faithful servant who believes his word is his bond. I don’t see his support for President Biden changing anytime soon.”

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