A system with such a de facto bias towards holders of certain political beliefs is antithetical to the founding principles of this country. The Constitution promises freedom of speech and the right to petition the government, not equality in these undertakings. Indeed, it should not. One person, one vote does not give the opportunity for a citizen to fully express the depth of his feelings about an issue. To single out cash contributions as an especially pernicious form of political participation to be limited and equalized is arbitrary and illogical.
Money is simply resources turned into paper for ease of storage and handling.
There is no difference between a business owner paying to have signs printed and distributed and a union leader having his members make the signs and post them. A politician would be equally beholden to either. Again there is no moral difference between buying your candidate media advertisements and owning a newspaper and using its editorial page to endorse your candidates. Yet the former is heavily regulated and under repeated attack while the latter continues to be protected by the First Amendment. Anyone who has been part of a movement knows there are those who will show up one night to stuff envelopes for free pizza, while others will devote large amounts of their time, money and effort.