Tonight on The ReidOut, Vice President Harris continues to build momentum with a big endorsement and promising new polls, while Trump is back on his heels, backing away from debating Harris. Also tonight, the veepstakes are underway as the vetting process begins to determine who might have the inside track to be Kamala Harris's running mate. Plus, President Biden has made reforming the Supreme Court a priority for his final months in office, which could impact the presidential race. 

Joy Reid leads this episode of The ReidOut awaiting Vice President Kamala Harris, who held a packed rally in Atlanta on Tuesday at the Georgia State Convocation Center. Harris' speech came after a guest performance by rapper Megan Thee Stallion, leading a legion of musicians and celebrities--from Cardi B to Lil Nas X--who have recently come out in support of Harris's bid. Joining Joy later in the hour is Fred Trump III, author of "All in the Family: The Trumps and How We Got This Way," and Michigan Governor Gretchen Whitmer, co-chair of the Harris campaign and author of "True Gretch: What I've Learned About Life, Leadership and Everything in Between."