If you are Catholic you should be aware that excommunication is most often automatic the moment an action for which canon law imposes that penalty (Latae Setentiae). Excommunication is not a punishment, but rather a medicinal penalty intended to invite the person to change behavior or attitude, repent, and return to full communion. Everyone who formally or materially supports a grave evil has been excommunicated, this includes those Catholics who voted for Obama and other pro-abortion candidates.
Peace be with you
But nobody tells them they are...they are just supposed to "know" it? Tell me again what earthly good that does.