Vice President Kamala Harris secures enough delegates to win the Democratic nomination. Also, a federal court upholds Mississippi's lifetime felony disenfranchisement law. Plus, Donald Trump's "No Tax on Tips" plan opens the door for a tax loophole for the rich. And Harris racks up key union endorsements. Rep. Marilyn Strickland, Barbara McQuade, Melissa Murray, Brendan Duke, and Randi Weingarten join Ali Velshi.