24 states sue to block a new Postal Service rule restricting mail-in ballots. Plus, groups report a spike in U.S. troops seeking to leave the military as conscientious objectors. And, Pennsylvania sees its first confirmed deaths from measles in 35 years. Jena Griswold, Priya Sridhar, Paola Ramos, and Josh Einiger all join the 11th Hour with Ali Velshi.