You've probably already about this excellent document, but in case you haven't, the Most Reverend Kevin Farrell, Bishop of Dallas, and the Most Reverend Kevin Vann, Bishop of Fort Worth, have issued a joint statement concerning the governing principles of a Catholic vote.
The American Papist has, by far, the best commentary on the document I've seen thus far. Go read his summary and then read the statement.
Bishop Vann is a son of the Diocese of Springfield in Illinois. Keep it up, Bishop Vann!