NEW : One person is arrested inside courthouse and 11 others outside . The event spotlights the two-year anniversary of a Supreme Court decision . A man who was shot in the head during an attempted robbery at a New York City convenience store has died, police said. Protests were also expected at federal courthouses in other cities .
NEW : One person is arrested inside courthouse and 11 others outside . The event spotlights the two-year anniversary of a Supreme Court decision . The decision allowed the rise of the Super PACs . Protests were also expected at federal courthouses in other cities .