This blog has now closed. Read more on the Harris delegate story here

Josh Shapiro, the Democratic governor of Pennsylvania, is widely speculated to be among Kamala Harris’s vice-presidential finalists.

Martin Pengelly explores Shapiro’s background for the Guardian:

July was the best grassroots fundraising month in presidential history.

Team Harris raised more across grassroots channels in the four days following President Biden’s endorsement of Vice-President Harris than Trump’s big donor-reliant operation raised in the entire month.

More than 3 million donors made over 4.2m contributions – with more than 2 million donors making their first donation this cycle.

This month, 94% of all our donations were under $200, and teachers and nurses continue to be among the most common donor occupations.

Compared with June, we saw more than 10 times the number of gen Z donors, and more than eight times the number of millennial donors.

Sixty per cent of all donors in July were women.

Coalition groups that organized calls since launch – like Black Women for Harris, Latinas for Harris, and White Dudes for Harris – raised more than $20m for Team Harris.

This blog is closed. You can find our latest US elections coverage here.

Kamala Harris’s campaign has announced a $50m advertising blitz ahead of the Democratic national convention next month with a television ad that portrays the presumptive Democratic nominee as “fearless”.

The 60-second ad will be the first in a series of paid media efforts ahead of the convention, which begins 19 August in Chicago.

We believe in a future where every person has the opportunity not just to get by, but to get ahead. Where every senior can retire with dignity. But Donald Trump wants to take our country backward. To give tax breaks to billionaires and big corporations and end the Affordable Care Act. But we are not going back.