A supporter holds a sign as he listens to Sen. Bernie Sanders at a rally for mayoral candidate Heath Mello in Omaha, Neb., on April 20.
A supporter holds a sign as he listens to Sen. Bernie Sanders at a rally for mayoral candidate Heath Mello in Omaha, Neb., on April 20. Charlie Neibergall Associated Press
A supporter holds a sign as he listens to Sen. Bernie Sanders at a rally for mayoral candidate Heath Mello in Omaha, Neb., on April 20. Charlie Neibergall Associated Press