Well, actually, Sebelius has already been asked by her own bishop not to receive communion, which is essentially the same as telling her she’s not a practicing Catholic any more.
That is one of the rare "strong" statements made by a Bishop. Of course, if she shows up at just about any Mass, she will receive anyway. No one will stop her. In most cases, people will be giddy to offer Communion to such a celebrity.
Just watch in a few months when Kennedy croaks. Full Catholic funeral with all kinds of famous abortion Catholics receiving.