By singling out Democrats, are you claiming that the Koch brothers and Sheldon Adelson haven’t influenced the government in ways that are beyond the scope of what citizens should be capable of?
Their influence largely comes from their ability to buy media timethrough PACs. Direct contributions to politicians is still highly regulated. You could argue that they can wield influence by threatning current politicans to fund the campaigns of competitors but at the end of the day this still happens through PACs buying media campaigns.
The influence of the Koch's or Adelson is largely hinged on the fact that Americans don't use critical thinking when consuming their media. Rather than trying to find a way to wiggle around the first ammendment when it comes to spending on speech, why not try to build an electorate capable of critical thinking? If you don't think that's possible, then what's the point of any of this?
While I can't be sure, I believe the commenter is referring to "democrats" (an actor in a democratic government) and not "Democrats" (actors within a political party in the US). Correct me if I'm wrong.