To increase young voters' turnout, we need to appeal not only to abortion rights but also to economic issues, Harold Meyerson concludes after reading the polls.Also: Ken Burns’ new documentary on PBS, “The US and the Holocaust,” searches for heroes and happy endings - but there aren't any, Historian David Nasaw argues.Plus: "Bad Mexicans”—that's what the revolutionaries of 1910 were called as they fought on both sides of the US-Mexico border against the robber barons and their political allies. UCLA historian Kelly Lytle Hernandez tells that story, which is the subject of her new book--it's been long-listed for the National Book Award.