I don’t think the full effect of Palin’s endorsement/robocalls have been taken into account yet.
http://conservatives4palin.com/2012/05/breaking-governor-palin-did-a-robo-call-for-ted-cruz.html
GOPe loses one (IN) and it’s a fluke
GOPe loses two (NE) and it’s bad luck
GOPe loses three (TX) and it’s rut-rohhh!!!