Excerpt: “It has become commonplace in American politics: Certain Roman Catholic bishops declare that the faithful should cast their ballots on the basis of a limited number of “nonnegotiable issues,” notably opposition to abortion. Conservative Catholics cheer, more liberal Catholics howl. And that is usually the end of the story.

” Not this year. Catholics, who are quintessential swing voters and gave narrow but crucial support to Presidenti Bush in 2004, are drifting toward Barack Obama. And this time, some church leaders are suggesting that single-issue voting is by no means a Catholic commandment.”