The main contra-agent to corporate censorship is competition. But the U.S. by political choice doesn't really have strong competition law, anti-competitive behavior is profitable, so it's likely most people in the U.S. will continue to have one or two choices in ISPs.

The next contra-agent is making sure states allow local municipalities to own, or regulate, and offer alternatives.

The track record for Republicans in the similar case of health care insurance is, ignore the problem of lack of competition, allow mergers and conglomeration. As a party, it's ideologically lost on both issues.

And the track record for Democrats is not really that much farther behind, they took a busted anti-competitive health insurance market and made it compulsory, while also offering no public option like a Medicare or Medicaid buy-in even though they certainly would have had the votes for it.

So either party poses difficulty with censorship free internet, but as there's no viable 3rd party, for now the emphasis should be on getting more technically qualified people elected at all levels of government, and accept that a lot of persuasion is going to be needed to bring Democrats along.