Sensibly Feldman avoids dealing with evolution, the one area where the right has some guilt, in my judgment. A fair analyst would have to grant that a sizable minority of people on the right deny evolution.
We in the U.S. operate a "big tent" political system where either party needs to assemble a majority to win. I'm willing to share the GOP with people who don't believe in evolution, but do share my views on small government, strong defense, etc.
Fortunately, beliefs vis-a-vis evolution make absolutely no difference in the continued functioning thereof. The fittest continue to out-survive and out-thrive the rest.