The interest in a John Thune 2012 bid is pretty clearly confined to inside the Beltway—he averaged less than 1% across these 18 polls. He never got a level of support higher than 2% and the number of states where he got that—5—was smaller than the number of states where he registered at 0%—6. He will almost literally have risen from nothing if he somehow snags his party's nomination [Tom Jensen, "Wrapping up the 2012 GOP Polls," Public Policy Polling, 2010.11.16].
Let's see... add South Dakota, and that's six whole electoral votes. That's almost as good as Alf Landon. Still barely blipping... maybe it's time to declare Kristi Noem his running mate.