No one knows what the numbers are for your too specific for politics definition of Catholic is, but republicans got 62% of the white Catholics vote that go to church at least once a week.
To get to the 80s you would have to go with the white evangelicals that go to church every week, republicans got 83% of their vote.
The canon law of the Catholic Church sets the following requirements: 1) Baptism 3) Total acceptance to the revelation of Jesus Christ as interpreted by the Church. 2) Adult Confirmation of Batismal vows (see 3) 3) Acceptance of and adherence to all other Church laws (ex: the sanctity of life) 4) Confession of sins through the sacrament of reconciliation periodically and as necessary 5) Attendence at Mass weekly and on Holy Days (1-4 are repeated during Mass) There are celebrites and political figures who call themselves Catholic, but fail to meet these requirements. When Church spokesmen are asked why someone like Ted Kennedy has not been excommunicated, the answer is frequently that no man can see into the heart of another man, but that he may have excommunicated himself. The media may accept the idea that anyone calling himself a Catholic is one. This is not the case, because religious affiliation is not the same thing as ethnicity. I don't know (and I REALLY don't care) what the rules are for evangelical Christians. The Catholic Church's rules are quite clear, and they have been in place for centuries. If you're not following them, you're not a Catholic. Period.