Up w/ Chris Hayes panelists Kim Barker, reporter at ProPublica; Bhaskar Sunkara, founder and editor of Jacobin Magazine; Alexis Goldstein, a former Wall Street vice president, now a member of Occupy Wall Street; and Steve Coll, author of "Private Empire: ExxonMobil and American Power," discuss the shadowy world of dark money in the post-Citizens United era.May 19, 2012
