Jonathan Adler is belittling Sam Brownback's relatively nuanced (for a politician) position on evolution. The comment thread is getting pretty heated, almost entirely in a direction that seems to me to miss the most important factor in interpreting his position. I would go so far as to say that most of the commenters are immorally taking Brownback's position in the least charitable way possible.
Roughly speaking, the problem seems to be that Senator Brownback is using language that leaves the issue wide open, where what he says is consistent with anything from theistic evolution to six-day creationism. The charge is that he is using coded language that's supposed to tell six-day creationists he's with them, while also using coded language to tell theistic evolutionists that he's with them, or something like that anyway. The assumption is that he couldn't be genuinely conflicted on this issue in a way that's consistent with rationality. I want to suggest that the most plausible interpretation of his comments is not the political coded language one but that he really is conflicted in such a way and that it even results from rational conflictedness.
Given that many people do think the most reasonable interpretation of the first chapters of Genesis is that the world was really created in six days 10,000 years ago (note: I don't think this is the most reasonable interpretation of Genesis 1:1-2:3, given its poetic elements, but I can understand how an intelligent, rational person might think it is), I can understand why he might genuinely feel conflicted, resulting in the following views:
1. Whatever the Bible teaches is true.
2. The Bible's teaching can be interpreted in a way that's consistent with the consensus among contemporary scientists, but some interpretations are more reasonable than others.
3. Science isn't infallible and has often been very wrong, even when scientists are correct at the time to think their best information leads them to that view. Most of the time these are minor variations, but sometimes they are major overthrows.
4. The most plausible interpretation of the Bible conflicts with the contemporary consensus.
I can easily see why an intelligent, informed person who knows all the science and understands why the consensus holds what it does might still refrain from holding any belief whatsoever on whether speciation occurred in the way the consensus says it did. The key is to insist both that (a) our interpretation of the scripture might be wrong and (b) our science has at least some chance of being wrong, while insisting that (c) whatever the Bible does say is true (whether our interpretation is correct or not) and (d) whatever a perfect scientific study would result it will almost certainly be correct.
Only if you assume from the outset that divine revelation about such matters is impossible could you end up concluding that such a person is irrational.