You are under the impression, I think, that this is something that happens. It does not -- this is already illegal (all the things you mentioned) and against ethics rules in both houses.
Lobbyists, for the most part, wield power not because of the money they give to politicians, but because of the votes that they implicitly command from the constituents on behalf of whom they are operating. They also command considerable power because they have research organizations that are better funded than congressional staff allocations for doing things like authoring bills.
Way more fishy is the revolving door when politicians leave office; that is done openly and without shame. Somewhat fishy are implicit bribes (like buying 1000s of copies of a politician's book), and sometimes preferential terms on loans, or employing family members (or buying their art for ridiculous prices).
But lobbyists and vendors are already very tightly locked down -- the things you are talking about simply do not exist; politicians and special interest groups have found better ways of buying votes.
Lobbyists, for the most part, wield power not because of the money they give to politicians, but because of the votes that they implicitly command from the constituents on behalf of whom they are operating. They also command considerable power because they have research organizations that are better funded than congressional staff allocations for doing things like authoring bills.
Way more fishy is the revolving door when politicians leave office; that is done openly and without shame. Somewhat fishy are implicit bribes (like buying 1000s of copies of a politician's book), and sometimes preferential terms on loans, or employing family members (or buying their art for ridiculous prices).
But lobbyists and vendors are already very tightly locked down -- the things you are talking about simply do not exist; politicians and special interest groups have found better ways of buying votes.