Actually, you can reasonably infer he wants the faithful not to vote for Obama/Biden.
Other than that, they could vote for Romney/Ryan, for some other candidate on the ballot, for a write-in, or skip the top of the ticket.
NOT voting to promote abortion, sodomy/pseudogamy, etc. is a moral requirement. Who you do vote for (if anybody) is a prudential judgment.
Honest question: Are protestants and evangelicals as antiabortion as the Catholic Church?
Are their pastors/preachers making statements like this today?
The bishops need to say that gay “marriage” is wrong, not because the church or the bible says it is, but because it is against human nature.