The New Republic article is titled, "The Unelectable Whiteness of Scott Walker," with the sub-heading, "A Journey Through the Poisonous World That Produced a Republican Star."
This is completely insane. I have followed Walker's career for a long time, and there is nothing in his record that can plausibly be given a racial tinge. What does TNR have on him? He supports voter ID legislation. That's it. Of course, every Republican politician supports voter ID, as do a lot of Democratic pols. As for voters, I believe most polls show around 70% support. All of which is to say that the New Republic's smear is pathetic, made up out of whole cloth.
I'm moving to a theory that carpet bombing with falsehood is all the Progressives have left. A good, but painful data point on the road to recovery.