The map shows that more Catholics are loyal to the Democrat Party than to their church....sad.
I noticed that overlap as well. But remember, the state of the institutional church is such that self-professed 'catholics' tend to be in name only - CINO.
And that tends to be rebellious, 'reformist' - that's right, liberal, and proud of it. I'm Catholic. I live in a blue county in a blue state. I voted for Bush, father and son, twice each. But then I'm not a 'reformed Catholic', like those around me. I'm Catholic, and am quite unwelcome at the local corner parish advertised as 'Catholic' in the local phone book.
Such are the times.