Bill Sali. LOL

Although I think ID-02 is actually the closer of the two in terms of partisanship these days thanks to the panhandle becoming neo-Nazi militia central.

You made me curious enough to look it up and 2012 was the last congressional election where ID-2 was redder than ID-1. Few factors I suspect — what you mentioned, plus the remaining blue dogs up north dying or switching parties and every Republican in Southern California moving to Canyon County.