JFK is a special case for obvious reasons but even then there's not a total Catholic bloc. For examples:
The darkest blue counties near the center of that map that clearly stand out are also the most heavily Catholic non-Hispanic counties in Texas...the Hispanic ones of course being the darkest red. Polar opposites.
Staten Island? Long Island?
Wisconsin has basically always been Lutherans (Scandinavians) in the west, Catholics (Germans) in the east. You can see how they broke there. Granted this is probably why JFK won Brown County (Green Bay) and the surrounding areas, but he still only won Brown by less than a point.
There are some pretty obvious areas evidencing a Catholic swing toward JFK, like those counties in the middle around Stearns and Scott. But he still lost almost all of mostly German and more Catholic than the state southern Minnesota, (oddly enough Jackson is the only county he won, which today is one of the LEAST Catholic ones in Minnesota) and got crushed in Redwood and Brown counties. Brown actually voted for Al Smith.
BTW I was originally going to say in the OP "except for 1928" but then remembered even that's not universal, Smith no doubt still got clobbered in the German areas in central Texas for instance. Perhaps with some excepts that still applies well, but if you have to go back to then or pre-McKinely for examples of Catholic bloc voting, well then you can probably see the lack of relevance today.
Nixon carried Wisconsin in 1960. And as I understand it, German Protestants trended to vote Republican and German Catholics tended to vote more Democratic.
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