First Thing: Kamala Harris introduces VP pick Tim Walz at raucous rally

Minnesota governor thanked Harris for bringing back the joy'. Plus: end-of-life patients find solace with psychedelics

• Don't already get First Thing in your inbox? Sign up here

Good morning.

One of the wildest periods in US political life is over. Joe Biden has abandoned his re-election bid and endorsed the presidential campaign of his vice-president, Kamala Harris. Yesterday morning, hours after securing the Democratic nomination, Harris announced Tim Walz as her running mate, a little-known Minnesota governor who is aformer social studies teacher, high school football coach and national guard veteran.

Where does he stand on reproductive freedom? Walz drew a personal connection to one of the most searing issues of the election cycle, saying he and his wife had two children through in vitro fertilization (IVF) after years of struggling with infertility. When we welcomed our daughter into the world, we named her Hope," he said.

A history-making' event. The Guardian spoke to hopeful attenders at the rally, as well as Cherelle Parker, Philadelphia's mayor, who told the crowd: Don't let Trump the trickster take our eyes off the prize."