Dr. Adams is making the case for a specific item in a broader debate:
Is it better to find common ground with the liberals - so as to make conservatism more attractive to the middle-ground independents? Or is it better to provide a stark alternative to liberalism (trans-national progressivism?) so that the undecided will be able to make a distraction-free decision?
I, like Dr. Adams, favor the second position. We should make the contrast between progressivism and conservatism clear. This is the principled position, and I think it is good politics as well.