The Colbert Report demonstrated what a joke this was more than two years ago.
…that this practice is still allowed simply demonstrates that politicians and the bureaucrats they employ are not actually interested in regulating campaign funds. Saying the IRS is afraid is dissemination, obfuscation, ignoring the facts on the ground. All professional politicians profit from the influx of secret money. Again I point back to,
…the way to fix this is to castrate the corporations. Short-term putting pressure on the IRS also will help.