Neither Mr. Santorum or President Obama has theology based on the Holy Bible.
http://www.puritans.net/news/opusdei050906.htm
What the Jesuit Order is for the left wing of the Roman Catholic Church, Opus Dei is for its right wing. (Hegelian politics at its finest, for the Roman Catholic Church cannot lose if it has strong ties with both ends of the political spectrum! Of course, to work it requires Protestants to be duped into political alliances with heretics.) Many Protestants are not familiar with Opus Dei though, so a bit of education is necessary.