This rare comment was noticed in an online comment. The commenter was talking about Attorney General Barr’s undermining the confidence in voting by mail, and the desperation of Trump and his minions to stay in power so that they can benefit financially. This is a congruent conflation of “milking the cow” and “bleeding/milking (something) dry”, both meaning to take as much of something from someone or something as possible. “Cash cow” (an investment that generates a lot of income) may also be in the mix, considering the context. A big thanks to Ron MacDonald for spotting this one.