Because they aren’t really Catholics.
Not so, they are all very involved, teaching, giving communion, deacons, on and on. I think most Catholics are hypocrites, and being raised so (12 years of Catholic schooling) I have seen enough to not have much respect for them in general.
So disagree if you will, but if I recall Obama carried most minorities (Mexicans) and many Catholics in his election bid.
My parents were Irish Catholic and always voted Dem.