I didn’t know you could opt out
Didn’t the campaigns pay for the delivery of these mailers? They have been defrauded. I would sue the crap out of the Post Office.
They don’t make it easy.
Usually it’s in fractional point font on the mailer, visible with an electron microscope (I’m exaggerating a little) or there is info on the circular company’s web site (if you can figure out what it is). Once you make the request, it takes something like 10 weeks (not an exaggeration), supposedly because mailers are printed and staged months in advance.