By the way, I think one of the comments at the Wolf PAC site has much better wording. It would also makes it crystal clear it refers to all sorts of organizations, including corporations.
The following article is proposed as an amendment to the Constitution of the United States, which shall be valid to all intents and purposes as part of the Constitution when ratified by the legislatures of three-fourths of the several States:
ARTICLE 28
Section 1. For all constitutional and legal purposes, entities created by operation of law are not persons, and do not have the rights of people.
Section 2. No entity not a person, and no people other than citizens, shall contribute to any political purpose. All contributions to political purpose shall be made public, with the name of the contributor and amount and nature of the contribution, and the name of the recipient.
Section 3. The Congress shall have power to enforce the provisions of this article by appropriate legislation.
Of course someone with actual legal training would need to review this for potential loopholes. It also seems to me Section 3 is superfluous, but maybe not. Finally, I'd really like to see an explicit declaration that money and other valuable considerations do NOT qualify as "speech" under the First Amendment. Otherwise, it seems to me American politics will always be tainted by some level of legalized bribery masked as Free Speech.