The Kennedy family denounces RFK Jr. for endorsing Donald Trump. Also, President Biden touts the country's economic recovery from the pandemic at the DNC. Plus, more Republicans announce their support for the Harris-Walz ticket. And Vladimir Putin bans a biography on Ukraine's Volodymyr Zelenskyy. Stuart Stevens, Arizona State Sen. Eva Burch, Jared Bernstein, Michael Brodkorb, and Simon Shuster join Ali Velshi.