The 2010 landmark Supreme Court case Citizens United ruled that Question 6 options: a) Congress could not limit what corporations or unions spent on an election, as long as the money didn’t go directly to a candidate. b) corporations and unions could donate unlimited funds to candidates for state and federal office. c) Congress could limit or ban advertisements run by corporations and unions 60 days before a general election d) Congress could limits super PACs, but not regular PACs