Congresspeople have people where it’s their job to keep a count of incoming contacts to gauge the opinion of their constituents. Where wealthy donors have undue influence is when Congresspeople directly contact them to ask for campaign donations. There’s a limit of a few thousand dollars, but part of that is that Congresspeople just tend to hear a lot about rich people problems. It’s not that they only care about wealthy people, it’s that they’re hearing from them more. You contacting them helps counterbalancing that undue influence.