Morning's Minion's response...

To Dr. Stockpole's reaction to my abortion post, can be found here, and is worth reading. An excerpt:

The fundamental problem with Stackpole's analysis is the following statement: "[to support Obama] you would have to show that McCain supports equivalent intrinsic evils, at least the moral equivalent of Obama's support for abortion."

This would only be the case if voting for a person who supported intrinsically evil acts. To vote for a person who supports an intrinsically evil act while supporting that position oneself is always formal cooperation in evil. But if you do not intend that evil, then you can apply the principle of double effect and vote for that person for proportionate reasons. This is spelled out quiote clearly in the Faithful Citizenship document.