This stream is set to begin at 5:30 p.m. ET. Please refresh if video hasn't started. Minnesota Gov. Tim Walz is set to deliver his first speech as the newly minted running mate of Vice President Kamala Harris at a rally in Philadelphia on Tuesday evening. "I couldn't be prouder to be on this ticket, and to help make Kamala Harris the next President of the United States," Walz is planning to say, according to excerpts of his speech. "She brings joy to everything she does." Walz will also mention his Midwest background, which Democrats see as an advantage for the ticket, potentially having an appeal to rural voters. "I was born