I think Sander’s proposed Amendment could be modified, as I did in Section 1, and made more explicitely fair in Section 4. If these changes were made, it would probably work.
One problem with such an amended Amendment is that labor unions and possibly even small political clubs would also be precluded from donating. However, I think that if no one except individuals could donate and their donations were limited to, say, $200, it would make for much fairer and quieter elections.
I don’t know offhand how we could handle the Rush Limbaughs or the severely biased newspapers.