I truly don't understand the content of that video, perhaps I'm ignorant of the way the US system works.

I see the donation/lobbying system as something wealthy individuals/groups can use to amplify their voices in political discussion. Equating limiting the amplification factor with censorship seems like a real stretch.

If policy makers are incentivised to make policy which benefits certain groups for reasons other than what best serves their constituents (i.e. to secure party donations) that to me is the essence of corruption.