Kamala Harris, VP pick Tim Walz make first joint campaign appearance in Philadelphia

At their first campaign rally together since Vice Pres. Kamala Harris announced Minnesota Gov. Tim Walz as her running mate, Harris introduced Walz and his many accolades.

She lauded the former teacher and high school football coach, saying, "In 91 days, the nation will know Coach Waltz by another name: Vice president of the United States."