I simply see no point in calling the voting behavior of people who don't vote like Catholics ought to vote the "Catholic vote". If their faith doesn't influence them to vote pro-life, why do you think it will influence them to vote any other way? Past history? I can assure you that my parents' vote for John F. Kennedy in 1960 has nothing whatsoever to do with how I vote today.
It seems that the first time the Catholics ever voted Republican was in 1972, or 1956 if we accept that disputed polling.
What has the Catholic vote been throughout our history if there is no such thing? How do we, as political people, address the Catholic vote if we pretend that it doesn't even exist except for those that already vote for us?