But I imagine something like this already exists?
*edit, this was actually directed @rectang
Exactly wrong. The solution to lies is not censorship, it is more truth. If censorship -- or prohibition of campaign money -- is the law, only the interested liars will control the machinery of censorship and they're not going to use it to promote truth.
If all personal campaign donations were illegal, the telecom monopolies would be even more powerful and unaccountable. They have armies of employees, ex-employees, influential executives, relationships with regulators, no-show jobs for pols' shiftless cousins, charitable foundations for networking paid for with your fees, and everything it takes to exercise influence without campaign cash. Only the existence of public spirited and ideologically motivated and unrelated agenda private donations can empower the leaders that do question the insider power of the telecoms.