Enforcing partisan loyalty has nothing to do with it. The linked blog post does not cheer for Obama. It says that being a White supremacist (or at the very least, hiring them and rubbing elbows with them) is not a mere detail. Even when the policy position is similar (as a talking point), the reasoning can be very different. When Ron Paul talks about the excesses of the national security state, he isn't addressing fans of Glenn Greenwald (and I count myself one). He is addressing the Black Helicopter crowd. When he talks about US policy toward Israel, he isn't addressing Noam Chomsky readers. He is addressing the Stormfront crowd. Many progressives believe that decentralization can be a good thing (e.g., see the local food movement), but Ron Paul's version is the same states' rights doctrine of the champions of segregation. I support challenging the status quo, of which the Democrats are a large part, but Ron Paul is not a good vehicle for that, if you are a progressive.
I am not worried that these distinctions are lost on Greenwald, but they may be lost on progressives and liberals who spend less time following politics and take what Ron Paul says at face value. For example, it's true that the statistics of prosecution and imprisonment of Black men are evidence of a racially biased process. However, it's naive to think that Ron Paul bringing it up at this time was anything other than a red herring to distract from his own racism scandal.