(AP Photo/Jacquelyn Martin) Members of the group Herndon Reston Indivisible hold up letters spelling "vote them out" during a protest of the confirmation of Brett Kavanaugh to the Supreme Court on October 6, 2018, outside of the White House. Y ou are the largest, most diverse, and progressive group of potential voters in American history, comprising fully 30 percent of the voting age population. On November 6, you have the power to alter the course of American politics—flipping Congress, changing the leadership of states and cities, making lawmakers act and look more like the people who are literally the nation’s future. But you need to vote . In the last midterm election, in 2014, only 16 percent of eligible voters between the ages of 18 and 29 even bothered. Now, I understand. I was young once. You have a lot on your minds—starting jobs, and careers, and families. Also, unlike your grandparents—some of whom were involved in civil rights, voting rights, women’s rights, the anti-...