Car dealer protectionism has nothing to do with the US Congress.
Citizens United doesn't make it easier to bribe politicians, the entire point of PACs running ads is to lobby voters directly instead of the traditional method of bribing legislators.
As long as anyone is allowed to give money to particular politicians and parties, as long as the entire political process is not funded exclusively from public money, then money will keep ruling the land.
As long as there's money in manipulating the government, then money will manipulate the government, whether it's through campaign donations, bribery, cronyism, or something else.
I agree that would solve a lot of problems, but it amounts to somehow shifting the IQ gauss curve for the whole population to the right a few dozen points. How would you go about accomplishing it?
Citizens United doesn't make it easier to bribe politicians, the entire point of PACs running ads is to lobby voters directly instead of the traditional method of bribing legislators.