This article is fascinating. (You can get a one day pass to Salon.) Many standard beliefs about how Catholics vote are questioned. Also raises a problem about Kerry picking Clark. They are both Catholic.
A few excerpts:
My sociological colleagues Jeff Brooks and Clem Manza have done the definitive work on "religious realignment" since 1950. "Realignment," in their work, is a movement of a religious group from one party to the other in its presidential vote, above and beyond the shift in the whole population in a given election. They report two actual realignments -- one a move from Republican to Democrat for liberal Protestants, and another from Democrat to Republican for evangelical Protestants. With the exception of the Kennedy "bump," Catholics continue in the same pattern of being more likely to vote for a Democratic president than white Protestants, given the general shift one way or another in a specific election.
snip...
Where do Catholics stand in this situation? As far as one can tell from the available data, they continue to be left-of-center, not as far left as black Protestants or Jews, but still further left than the Protestant majority. They were more likely than white Protestants to support President Clinton during the Evangelical crusade to get rid of him, more likely to oppose the Iraq war (as they did the Vietnam War), more likely to support social legislation -- more likely, in other words, to manifest the communal orientation that comes from their religious perspective
snip...
The issue about the Latino voters (I actually prefer the term Latins) is not whether they are Democrats, but whether they will vote. For reasons of culture and history they are not politically mobilized. (Whether they are less likely to be mobilized than Italians were a century ago is an interesting question.)
Here in Arizona (where I teach some of the time) a slight increase in their voting rates helped Clinton to win in 1996. If the Democrats could mobilize most of the Latinos in the state, it would become permanently Democratic (and the East Valley Mormons who currently run it would be swept out of office and my colleagues at the university would win a long-overdue raise).
on edit: forgot the link again
http://www.salon.com/opinion/feature/2004/03/27/catholics/index.html