[MisterBastahrd]

Corporations are just groups of people, and the Constitution says that people have the right to associate. Restricting corporations from donating to campaigns just shifts the donations to wealthy individuals.

A proper constitutional amendment would ban corporations from political speech and donations and ban individuals from using more than X dollars towards a political campaign or PAC or commercial, dollar adjusted by year. That way, corporations are out of the picture altogether and the rich can't just self-fund political campaigns and ads.

Of course, that'll never get past Congress much less a bunch of state houses.