On Santorum's recent comments, Andrew Sullivan writes:
Think about that: the number three Republican senator wants to allow the cops to police the bedrooms of straight couples to make sure there aren't any blowjobs. That's how far out there he is.
By that logic, any polictician who supports laws against incest "wants to allow the cops to police the homesto make sure nobody's sleeping with anyone they're not supposed to." Which, of course, was the point of what Santorium was saying.