We know the real reason Josh Romney decided not to run against Jim Matheson: because it would be like running against his own father. For example, we all know that Willard is a big fan of Guantanamo. In fact, the Mittster likes imprisonment without trial so much that he said he would double Guantanamo. (Take that, wimpy liberals!) Well, Matheson's one step ahead--he already voted for the Torture Bill.
Josh must have realized that there wasn't much more he could do to support the cause than Jim Matheson has already done, so what would be the point?