I’ve been SOOOOOOOOOOOO tempted to mail them a 2X4 with a note on it telling them to affix it to their spines, but can’t justify the postage.
You could just find a picture of a spine and send that.
But don't send it to the fundraisers, they will just pitch it. Instead, send it to your own Congressman or your Senators. It will get more attention there.