The problem with most voters, be they catholic, christian, jewish, atheist, etc. is that too often, their votes are cast based on "sound bites". My aging parents are a good example of how they 'receive' news. While my father will question what he is being fed by the major networks, he forgets to watch Fox News for a more balanced view. My mother, on the other hand, buys into "the language of cute Katie Couric." She (my mother) stunned me recently by unleashing a vitriolic attack on the president, basing her assessment of his performance on 'direct feed' from the likes of The Today Show. Like my father, she is programmed into watching and LISTENING to one-sided, liberal journalists.
There are a good number of conservative voting Catholics, just as there are conservative Jews and christians from various denominations. They will complain vociferously about the decline of propriety in the US, and shake their fists at politicians who have 'let them down'. But, on election day, once inside the voting booth, it seems their arms are 'hard-wired' to the Democrat line.