I can't make links on this tablet (no html brackets), but this Gallup poll report shows US religious denominations by state as of about ten years ago:
http://www.gallup.com/poll/12091/tracking-religious-affiliation-state-state
The only state with a majority Catholic population was Rhode Island, 52% Catholic. I've seen other polls that show there is no consistency in the "Catholic vote" in the US. I was brought up to think that a good Catholic could only vote Democratic, while other Catholics were brought up to think that good Catholics vote Republican.

I'm at the religious education congress put on every year by the Catholic Archdiocese of Los Angeles - 40,000 people are here. I went to a workshop this afternoon where two transgender Catholics told their stories. The meeting room was packed to overflowing, and the audience was enthusiastically supportive of these young people. I'm sure this sort of support wouldn't fit the stereotype many of you have of Catholics. Yes, we have an angry, vocal minority who are obsessed with homosexuals and abortion, but they're not the whole story.

-Joe-