@Flux @scottsantens I think we're structurally unable to do so.
The cost of buying an election really is quite small compared to the expected cost of effective taxation of great wealth on great wealth; the selective outcome is obvious. (E.g., Michael Bloomberg spent thereabouts of a billion dollars to keep Elizabeth Warren out of consideration in the Democratic primaries because that cost less.)
I'd argue that abolishing great wealth is necessary to functional democracy.