There is no Catholic voting bloc.

It irks me to no end that non-Catholics people of all political stripes continue to comment on what Catholics believe and how they vote in behave based on old tired stereotypes that do not much anything I have ever experienced. Now I don't find much useful information on CNN.com these days, but this piece is a must read for non-Catholics of any political persuasion about the non-existence of any monolithic Catholic voting bloc or culture:

.... the idea of a Catholic bloc is patently ridiculous. As voters, American Catholics mirror the electorate as a whole, divided into Democrats, independents, and Republicans at about the same percentages as all Americans. And it’s hard to trace such political complexity to religious allegiance.

The article goes on to make a distinction between "Latino" "intentional" and "cultural" Catholics that I do find to have some basis in reality:

Unlike the Italians, Poles, Irish and similar white ethnics, Latino Catholics have retained their distinctive identity as Catholics. Their voting behavior reflects that.
This is particularly true when considered from the perspective of the famous social teachings of the church, which emphasize social and familial solidarity, the common good, preference for the poor, tradition, and welcoming of the immigrant.
Latino American Catholics (excluding Cubans) strongly associated with the Democratic Party in 2008, with 67% of Latino Catholic voters supporting Obama. But the bloc includes swing voters, and turnout can be volatile. This vote can be critical in swing states like Colorado, Florida and New Mexico, and perhaps soon in states like Arizona and Texas.

An important social phenomenon for understanding intentional Catholics is what’s sometimes referred to as distillation. A study by the Pew Forum on Religion and Public Life last year found that one-third of those raised Catholic have left the church. Fully 10% of the American electorate is formerly Catholic....
But as a result of disaffiliation, many Catholics who remain with the church are “distilled.”  More and more of those who remain are those who actively choose to embrace the church and its teachings...
Largely white, with impressive education levels, mostly suburban and with moderate to high income levels, such Catholics are in evidence in weekly Mass attendance and parish activities. Politically active, intentional Catholic voters lean toward the Republican Party (with some youthful swing voters) and are motivated by economic issues and increasingly by opposition to abortion, same-sex marriage and illegal immigration.

“Cultural Catholics” make up the third important group of Catholic voters. They are a complicated mix of mostly white Americans with lower levels of Mass attendance and higher levels of ambivalence toward Church authority.
These assimilated voters have varying education and income levels, often hail from urban and suburban communities, are more female than male – often with blue-collar roots – and are not intentionally but culturally oriented toward the church.

Many culturally Catholic voters are at odds with both conservatives and liberals on many issues. They are more socially conservative than the majority of Americans, but many are put off by the more intense social conservatism of intentional Catholics and evangelicals.
They are more economically populist than most Americans but are uncomfortable with the libertarian zeal of the tea party.  They are alienated from the lifestyle liberalism of many progressives but remain supportive of unions and governmental programs for the middle class.
The bishops may have little role in these voters’ personal faith, but cultural Catholics look to the church for the sacraments that mark the turnings of their lives and for the traditions that connect generations. Their religious sensibility might almost be described as ethnic.

Even many supposedly culturally aware academics miss these characteristics of such a large portion of the American population and cling to 19th century stereotypes.  This is why any comments from conservative or liberal pundits on the contraception nontroversey and supposed monolithic Catholic reaction are nothing more than hot air.