Tonight on The Last Word: The Houston Chronicle Editorial Board endorses President Biden. Also, Ohio GOP candidates debate in a primary to decide who faces Democrat Sen. Sherrod Brown. Plus, Aleksei Navalny's death ignites fears of an even more dangerous Vladimir Putin. And Wisconsin Gov. Tony Evers signs new election maps into law. Andrew Weissmann, Tim O'Brien, Sen. Sherrod Brown, Ben Rhodes, and Ben Wikler join Lawrence O'Donnell.