Truely amazing numbers.
I guess this will put to rest the Walker euphoria once and for all.
The Favorite Son effect is usually worth about 10% -- before-after (both ways -- see Texas between 1996 and 2008), neighboring-but-similar states (contrast Michigan and Ohio in 1976), and effective campaigns/candidates vs. ineffective campaigns/candidates. South Dakota was one of the strongest states for George McGovern in 1972. The only condition in which it seems to not apply is max-out situations (Obama actually outdid Kerry in Massachusetts).
From Iowa came one portent:
45.9% HILLARY CLINTON
40.4% SCOTT WALKER
by a right-wing media site.
Republicans aren't going to lose Iowa by 6% or Wisconsin by 7% and win the Presidential election.