I only return fundraising mail received from GOPe organs if they’ve included a postage free (i.e., THEY pay for the postage) return envelope. I never include anything in the return mail with which they could identify me so they won’t stop including postage paid return envelopes in their mailings to me. Anything to bleed those detestable creatures financially.
I’ve notice recently they are more likely to have return envelopes that require me to place a stamp. I guess many others have also been conducting similar bleeding campaigns and collectively we’ve forced them to paying for the return postage.
I throw those envelopes in the mail with no stamp and no return address.