President Biden is on track to put away the Democratic nomination with ease — but even most of his own party thinks he's too old for the job.

In a new AP-NORC poll, 40% of adults associate Biden with words related to age or being confused.

• Former President Trump has his own problems. Asked what first comes to mind about Trump, nearly a quarter of respondents mentioned words such as corruption, crime, lying and untrustworthiness.

Why it matters: This foreshadows a potential 2024 rematch pitting Biden's age vs. Trump's legal peril, Axios' Erin Doherty writes.

77% of adults think Biden, 80, is too old to serve effectively for four more years, according to the AP-NORC poll of 1,165 adults (margin of error: ±3.8 percentage points).

• 89% of Republicans think Biden's too old — as do 69% of Democrats.
• That view is held across age groups, although voters 44 and under were more likely to feel that way.
• Still, 82% of Democrats said they'd at least probably support Biden if he's the nominee.

Trump, 77, faces less scrutiny for his age — even from Democrats.

• Just over half of adults think Trump is too old to effectively serve another term. 71% of Democrats say that, and 28% of Republicans.

🥊 Reality check: Biden's campaign says his age won't be a big motivating factor for voters. Advisers say his experience and wisdom are a huge reason for his first-term accomplishments.

🔮 What's next: Biden, already the oldest sitting president, would be 86 at the end of a second term.

• Trump would be 82 when his term ended.

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ChatGPT was 72% accurate in clinical decision-making on medical cases drawn from textbooks, from diagnoses to care decisions, Axios' Ryan Heath writes from Mass General Brigham study.

• Why it matters: AI could improve the efficiency and accuracy of diagnoses, as people live longer and care gets more costly.

The study is among the first to assess the capacity of large language models across the full scope of clinical care, rather than measuring a single task.

• ChatGPT got the final diagnosis right 77% of the time.
• In cases requiring "differential diagnosis" — an understanding of all the possible conditions a given set of symptoms might indicate — the bot's success rate dropped to 60%.

🔮 What's next: Marc Succi — the report's co-author, and executive director at Mass General Brigham's innovation incubator — told Axios that for AI models to be deployed in hospitals, success rates need to rise to 80-90%.

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Immigrants are joining the U.S. workforce at much higher levels than normal.

• They're likely to account for roughly half a million new jobs over the next nine months, Axios' Felix Salmon writes from a Goldman Sachs report.

Why it matters: As the U.S. continues to struggle with a historically tight labor market, immigrants are coming to the rescue of desperate employers — while also creating new jobs themselves.

🧮 By the numbers: Between the pre-pandemic month of January 2020 and July 2023, the immigrant labor force grew by 9.5%. That compares to a tiny 1.5% growth rate among the native-born.

🧠 What's happening: The foreign-born labor force is growing for three main reasons.

1. Immigration: The rate at which the U.S. is issuing visas — both temporary work visas and permanent green cards — has risen by about 335,000 workers per year over the past 12 months, to a level near record highs. That's partly because the government has begun clearing the COVID-induced backlog.
2. Participation: The foreign-born labor force participation rate has jumped by 2.3 percentage points to 67% over the past two years. By contrast, the native-born rate has risen by a meager 0.4 points, to 62.2%.
3. Demographics: The great retirement of the Boomer generation is taking place mainly among the native-born — most immigrant workers aren't yet facing retirement. As a result, millions of new native-born workers need to enter the workforce every year just to keep the total native-born labor force constant, let alone growing.

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The first group of aides moved this month to President Biden's new campaign headquarters in downtown Wilmington, Del., 110 miles northeast of Washington, Axios' Alex Thompson reports.

• Why it matters: Biden officially announced for re-election in April. But his campaign has ramped up gradually, with a small team working remotely or in Washington at the DNC offices.

What's happening: Parts of the Delaware office are still under construction, including an in-house studio.

• White House reporters who follow the president to Wilmington on weekends have been giving campaign staffers recommendations for restaurants and running trails.

Between the lines: Some on Biden's team wanted the campaign's base to be in nearby Philadelphia. The foremost advocate for Wilmington was a former U.S. senator from Delaware ... Joe Biden.

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A gunman killed a UNC-Chapel Hill faculty member in a lab building in the center of campus, setting off a confusing three-hour lockdown at the university and nearby K-12 schools, Axios' Zachery Eanes and Michael Graff report.

• Campus officials and police said at an evening press conference that a suspect was taken into custody about an hour and a half after gunfire was first reported. They didn't identify that person or the faculty member.

The shooting at Caudill Labs occurred as students began the second week of classes. It was the first day for Chapel Hill-Carrboro City Schools.

• Classes are canceled today. UNC announced a hotline for "concerned parents, loved ones and community members."

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Idalia strengthened to a hurricane today — and is forecast to become "an extremely dangerous major hurricane" before making landfall on Florida's Gulf Coast tomorrow.

• Tampa Bay officials urged some residents to evacuate yesterday, Axios Tampa Bay's Selene San Felice reports.

The hurricane is expected to hit between Tampa and Tallahassee — perhaps as a fearsome Category 3 hurricane. High winds and flooding could begin in that swath today.

• Florida Gov. Ron DeSantis declared a state of emergency in 46 counties.

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The CEOs of the most powerful U.S. tech companies are heading to Capitol Hill next month for Senate Majority Leader Chuck Schumer's first AI insight forum, Axios' Maria Curi and Ashley Gold report.

• Why it matters: Schumer's AI Insight Forums are intended to educate lawmakers on the rapidly evolving technology and lay the groundwork for regulation.

The closed-door forum, scheduled for Sept. 13, will include X's Elon Musk, Meta's Mark Zuckerberg, Google's Sundar Pichai, OpenAI's Sam Altman, Nvidia's Jensen Huang and Microsoft co-founder Bill Gates.

• Microsoft CEO Satya Nadella, former Google CEO Eric Schmidt, civil society groups and unions will also attend.

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Self-driving taxis are rolling into a growing list of American cities, Axios autonomous vehicles expert Joann Muller writes.

• Why it matters: As San Francisco has learned, frustrated cities can find they don't have much authority if robotaxis cause headaches.

What's happening: Phoenix, San Francisco and Austin are currently the only cities where you can hail a driverless robotaxi. But that list could grow by a dozen or more within the next year.

• After investing tens of billions of dollars in research and development, robotaxi companies Cruise and Waymo are shifting their focus to commercialization.
• Most of the planned markets are in the Sun Belt, where the weather is favorable (AVs struggle in snow) and state policies are welcoming.

GM-owned Cruise has really hit the accelerator, announcing testing in 14 cities, including Seattle, San Diego, Miami, Nashville, Raleigh, Charlotte, Atlanta and D.C.

• Dallas and Houston are closest to launch.

"We're on a trajectory that most businesses dream of, which is exponential growth," Cruise CEO Kyle Vogt told GM shareholders in July.

• Cruise aims to deliver $1 billion in revenue to GM in 2025.

🔮 What's next: Cruise's upcoming Origin robotaxi has no steering wheel or pedals.

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