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I beleive that the Universe operates in a "lawful" manner and that the tools of science are valid ways of discovering the nature of those laws. While their may be wiggle room in various scenario's concerning the rates of change (steady on a genetic level vs rapidily on a speciation level), the basic premise of evolution is as thoroughly based in fact as is the basic premise of gravity or entropy.
Anyone who puts effort into casting doubt on these premises is doing so out of either ignorance or dishonesty and in our current political environment, the dishonesty is pretty high on the list.
As such, "belief in evolution" is a pretty good one-up indicator of a belief in rationality. I don't know about you, but I have a significant degree of difficulty trusting someone who isn't rational. And trust me, it isn't a short list.
But then again, I'm arguing with someone who called WT a warmonger.