Don't see how that's possible based on the presidential voting results for Roman Catholics. In all but four presidential elections since 1952 they've sided with the demoncrat candidate...and this is well before the massive influx of Hispanic immigrants.
Now, if you want to apply that to just the 2018 midterms I might be in agreement with that.
ealgeone:
That is true, all my family were democrats, they like many other Catholic ethnic groups, Italians (like me), Polish (like my wife), Irish, Bavarian-Germans, or French, voted for Kennedy 75%. However, those same people were the mainstay of the Reagan Democrats. Nixon in 72 was the first Republican to get over 50% of the Catholic vote, Carter got them back in 76 but Reagan got 61% in 1984 (the most ever). I think about 59% of Catholics are Non-Hispanic White (consists of family name from among 1 of the 5 ethnic groups I mentioned above). In 1990, the statistics were probably about 70-30 Non-Hispanic white to other ethnic groups, mostly from Central and South America. Republicans have pretty much Nixon in 72 gotten most of the Non-Hispanic white Catholic vote. But even if those groups account for 70% of the Catholic vote, getting 60% of that vote only equats to 42% of the total Catholic vote. Even getting 70% doesn’t get you to 60% (49%).
So Allen’s basic hypothesis is correct.