[Francis Cardinal] Arinze said that he is regularly asked if a person who votes for abortion can receive Holy Communion. He replies, "Do you really need a cardinal from the Vatican to answer that?
"Get the children for first Communion and say to them, 'Somebody votes for the killing of unborn babies, and says, I voted for that, I will vote for that every time.' And these babies are killed not one or two, but in millions, and that person says, 'I'm a practising Catholic', should that person receive Communion next Sunday? The children will answer that at the drop of a hat. You don't need a cardinal to answer that."
Indeed, it's so obvious that any child can answer it. It takes a self-deluding, self-appointed alternate magisterium, "I am my own personal Pope" type of pride to deny that such a person has abandoned Christ and His teachings.