Talk comes up now and then, sometimes in the context of candidate recruitment, about which of Idaho's two congressional districts is the more Republican (or relatively more Democratic).
If presidential election numbers can serve as a proxy, a sort-of answer is now available: The two districts are almost identically partisan.
A congressional district breakdown of Idaho (through the Daily Kos site, along with breakdowns of other states) shows the two districts within a few tenths of a percentage point of each other. Republican Mitt Romney got 64.91% in the first district (northern and western), and 64.14% in the second (southern and eastern). Romney's best county in the state, meaning it has a claim on being the reddest in deep red Idaho, is Madison (county seat: Rexburg), at 93.29%. - Randy Stapilus