Baloney. Your assertion is fifty years out of date. First separate white Catholics from Latino Catholics. Then, take the white Catholics and separate those who go to church every Sunday from the EasterandChristmasOnly ones. White Catholics who go to weekly Mass are heavily Republican. In 2008, my hometown, an affluent suburb of NYC that is half white Catholic, half WASP, the breakdown was this: Catholics who go to church every week went dramatically for McCain, and it was among the WASPs whom Obama was the most popular.
Catholics have always voted democrat (with a handful of exceptions), including before the recent influx of Hispanic members of the Christian denomination.
You just lived through the best Catholic voting period of American history, the Catholic vote went republican for the first time, in 1972, (with the probable exception of 1956 when many or most sources think that they voted republican) Catholics voted republican 4 more times during the 40 years after that.
It looks like that history thwarting period is over, as the Catholic vote returns to it’s normal place in American politics.