[wrinklz]

The argument that limitations to campaign finance are a free speech issue makes sense. What doesn't make sense is treating corporate and other organizations as persons with all or even most of the rights of air-breathing U.S. citizens. Corporations and unions and other such groups are legal entities which exist only for the public good. The state created them, and the state can regulate them in any way which benefits the public good.

Edit - And regarding enforcement, I would just encourage stiff penalties. An organization found guilty of multiple instances of finance fraud could be charged with RICO and it's leaders thrown in jail. So much for enforcement.