Sens. Elizabeth Warren, Kamala Harris and Amy Klobuchar, each rumored as potential 2020 presidential candidates. Photos: Paul Marotta via Getty Images; Ethan Miller via Getty Images; Theo Wargo via Getty Images for DGA

52% of Americans — including 45% of men and 60% of women — say they would feel "very comfortable" having a female president, according to a new study by Kantar Public.

The big picture: The Reykjavik Index for Leadership ranks the U.S. third among G7 countries in terms of the percentage of people who would be comfortable with a female head of state. The U.K., which is currently led by Prime Minister Theresa May, came first with 58%, while Germany — which has been governed by Chancellor Angela Merkel for the past 13 years — ranked sixth with 26%.

By the numbers:

  • U.K.: 58% (52% of men, 65% of women)
  • Canada: 57% (49% of men, 65% of women)
  • U.S.: 52% (45% of men, 60% of women)
  • Italy: 42% (34% of men, 49% of women)
  • France: 40% (39% of men, 42% of women)
  • Germany: 26% (23% of men, 30% of women)
  • Japan: 23% (20% of men, 26% of women)

Go deeper: Trump's 2020 woman problem

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Harris previews dual role in debut speech: Attacking Trump and humanizing Biden

Sen. Kamala Harris began her first speech as Joe Biden's running mate excoriating President Trump for his "mismanagement" of the coronavirus and scorn for the racial justice movement, before quickly pivoting to how she came to know Biden: through her friendship with his late son Beau.

Why it matters: The debut speech on Wednesday underscored the dual roles that Harris will take on for the rest of the campaign — humanizing Biden during a moment of national crisis and "prosecuting" the case against Trump as a failed president.

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The two sides of America's coronavirus response

Illustration: Eniola Odetunde/Axios

America's bungled political and social response to the coronavirus exists side-by-side with a record-breaking push to create a vaccine with U.S. companies and scientists at the center.

Why it matters: America's two-sided response serves as an X-ray of the country itself — still capable of world-beating feats at the high end, but increasingly struggling with what should be the simple business of governing itself.

Joe Biden introduces Kamala Harris in first joint appearance

Joe Biden formally introduced Sen. Kamala Harris as his running mate on Wednesday, telling a socially distanced audience in a Wilmington, Del., gymnasium: "I have no doubt that I picked the right person to join me as the next vice president of the United States of America."

Why it matters: Harris is a historic pick for vice president, becoming the first Black woman and first South Asian woman to be named to a major-party U.S. presidential ticket. "Kamala knows how to govern," Biden said. "She knows how to make the hard calls. She is ready to do this job on day one."