Best to go with Newt. He is the most articulate, intelligent, and experienced candidate. Despite his past mistakes ( nobody with a forty year public career is without blemish),he will take it to Obama, make the country realize what is at stake and will win in November 2012.
Not to worry, Newt will win. The tea party folks will not allow the establishment to pick another moderate looser like Mittens.
Part 1: Legislative Proposals
Part 2: Day One Executive Orders
Because he knows where the bodies in DC are buried...
(and lots of other reasons, too)