Photos: Olivier Douliery/AFP via Getty Images; Drew Angerer/Getty Images

Joe Biden is beating President Trump by 13 points in Florida — 51% to 38% — per a Quinnipiac University poll released Thursday.

Why it matters: With its 29 electoral votes, Florida is a key state for the president to hang onto in order to win re-election.

  • Respondents favored Trump on handling the economy (50% to 47%) but thought Biden would be better at handling issues like health care, the coronavirus response, a crisis and racial inequality.

Flashback: In late April, respondents put Biden ahead of Trump in the same poll by just four points (46% to 42%).

  • And in mid-July 2016, Trump was ahead of Hillary Clinton by three points (42% to 39%).

The big picture: 70% think that the spread of coronavirus is out of control in the state, and A majority of Floridians (61%) believe Gov. Ron DeSantis (R) reopened the economy "too quickly."

  • 79% say that people in the state should be required to wear face masks in public. Florida currently has no mask mandate.
  • 62% also believe that it will be unsafe to send kids to K-12 schools in the fall.

Methodology: The RDD telephone survey was conducted from July 16 – 20 to 924 Floridians who self-identified as registered voters with a margin of sampling error of +/- 3.2 percentage points.

Go deeper

Biden calls for 3-month national mask mandate: "Be a patriot"

Joe Biden called on governors to issue a three-month mandatory outdoor mask mandate on Thursday, telling reporters after receiving a coronavirus briefing that experts say it could save over 40,000 lives.

Why it matters: Biden was more aggressive and specific than he has been in previous calls to wear a mask, arguing that it will allow children to return to school sooner, businesses to reopen and help "get our country back on track."

Biden and Harris start joint coronavirus briefings

Photo: Mandel Ngan/AFP via Getty Images

Sen. Kamala Harris joined Joe Biden on Thursday for a briefing on the coronavirus pandemic led by four doctors and one of Biden’s senior advisors — marking the new Democratic ticket's first official day of work.

The big picture: Biden said that he receives these briefings — “on the state of coronavirus here and around the world” — four times a week, and noted that they usually last between an hour and an hour and a half. It's not yet clear how many frequently Biden and Harris will be briefed.

Updated 7 hours ago - Health

U.S. coronavirus updates

Data: The COVID Tracking Project; Note: Does not include probable deaths from New York City; Map: Andrew Witherspoon/Axios

Two therapies are known to help treat patients who have contracted the coronavirus, and more may be announced by late September, NIAID director Anthony Fauci tells Axios.

Why it matters: Antibody drugs and various medicine cocktails against the virus are progressing and could provide some relief before vaccines become widely available.