The South definitely is the one region where the really hard-right brand of Republicanism is politically dominant in most of its states (and it's hard to separate it from right-wing evangelical Christianity-another liability for the GOP nationally in the 2010s).
Sure, Kansas or Michigan or whatever have elected a lot of Republicans into office, but the Plains and certainly the Upper Midwest are not totally dominated by "Teavangelicals" to the extent much of the the South is. And arguably, Southern-style Republicanism incentives other states' Republicans to move to the Right (since the South has a lot of gravity in the Republican primaries).
You're telling me the Kansas GOP isn't dominated by right-wing Christian nutjobs? Who is their governor, again?