...Our Catholic tradition has always recognized the possibility of “invincible ignorance,” whereby a person does something wrong while sincerely and perhaps blamelessly believing it to be right. I doubt many Americans voted for Obama thinking they were doing something wrong.
On the other hand, this doesn’t mean that we aren’t morally responsible for this choice. Some people may have allowed more superficial concerns triumph over more weighty moral issues in determining which way they would vote. All who voted for Obama will in some way share in the responsibility for his actions as president, at least as far as they were foreseeable. As far as life issues, marriage, and school choice go (to take three key moral issues), we already know where Obama stands and what he intends to do. Personally, I wouldn’t want that on my conscience....
More Catholic Response
American Catholic has the latest diplomatic response from USCCB, the Pope, and (less diplomatic) a prof. of moral theology in Rome: