of citizens of the State, it must apply equally and uniformly to all associations of citizens of the State. 3. A person who is not a citizen of the United States, including an association of persons who are not citizens of the United States, a foreign government, or any person acting as an agent thereof, may not contribute funds or donate in-kind equivalents to candidates standing for election to public office in the United States or otherwise expend funds or donate in-kind equivalents in a manner intended to influence the outcome an election for public office or plebiscite in the United States. 4. The powers provided by this article are limited to the content neutral regulation of political contributions and political expenditures. 5. Congress shall have the power to enforce this article by appropriate legislation. .