Independents and Reagan Democrats will not support Santorum.
Both subsets are waiting which strong horse emerges between Newt and mittens.
Santorum holdouts need to declare their sympthies now, if they have the backbone. They are either for Mittens or Gingrich when Santorum does endorse.
If you think people with a backbone let others tell them what they "need" to do, you clearly don't understand the concept.