In my opinion, Newt IS running against Santorum to determine which of them will unite the Conservative vote to defeat Romney. A series of one-on-one Lincoln-Douglas debates between those two--hosted by conservatives--is exactly what we need.
I am surprised we have not heard more about Santorum challenging Newt to a one-on-one.
Santorum isn’t going anywhere. No organization, no money, no leadership cred. The pro-life message is doubtless genuine but that alone cannot win the nomination.