They don't ask the Pope, they don't ask the person's pastor, they don't ask to see a baptismal certificate, they don't ask to see church contribution records, they don't administer a doctrinal test, etc.
Out of self-identified Catholics in the U.S., what percentage actually attend Mass weekly? (I should point out that this is required to be a Catholic in good standing; it's not a "nice thing to do on a Sunday morning" like it is in a lot of denominations.) The percentage is probably in the low 40's. Now, if the other 55+ % can't be bothered to order their lives according to Catholic teaching enough to show up at Mass on Sunday, why should anyone think that Catholic teaching would have any relevance to their behavior in the voting booth? If they live like pagans, they're probably going to vote like pagans, right?
So it would be a fine thing if the Catholic Church could bring her disobedient sons and daughters back to the fervent practice of their faith, wherein they would learn to vote for candidates that uphold human life and traditional marriage, for starters. (Oh, and then there's that little gem from Pope Pius XI, "No one can be at the same time a good Catholic and a true socialist".) Until then, Matthew 18:17 applies.
This is about the Catholic vote, period, 54% of Catholics voted for Obama, that is the reality except as seen by a handful of people who want to go into trying to excommunicate them because they want better polling data, using the most pure Catholics only for generic American political data.
You are right, they are removing these people from the Catholic church without asking the Pope, because I’m pretty sure that the Pope is still counting them as Catholics.
This idea of wanting to pretend there is no Catholic vote or jumping through hoops of pretense, and even trying to convince people that Catholics are not Catholics is bizarre and infantile.
No one else does all this angry game playing. Do we really have to remove the category of Catholic, and Jewish, and Protestant, and Evangelical, and atheist?