Glenn Greenwald in Salon.com:

The simple fact is that progressives are supporting a candidate for President who has done all of that — things liberalism has long held to be pernicious. I know it’s annoying and miserable to hear. Progressives like to think of themselves as the faction that stands for peace, opposes wars, believes in due process and civil liberties, distrusts the military-industrial complex, supports candidates who are devoted to individual rights, transparency and economic equality. All of these facts — like the history laid out by Stoller in that essay — negate that desired self-perception. These facts demonstrate that the leader progressives have empowered and will empower again has worked in direct opposition to those values and engaged in conduct that is nothing short of horrific. So there is an eagerness to avoid hearing about them, to pretend they don’t exist. And there’s a corresponding hostility toward those who point them out, who insist that they not be ignored.

The parallel reality — the undeniable fact — is that all of these listed heinous views and actions from Barack Obama have been vehemently opposed and condemned by Ron Paul: and among the major GOP candidates, only by Ron Paul. For that reason, Paul’s candidacy forces progressives to face the hideous positions and actions of their candidate, of the person they want to empower for another four years. If Paul were not in the race or were not receiving attention, none of these issues would receive any attention because all the other major GOP candidates either agree with Obama on these matters or hold even worse views.

Progressives would feel much better about themselves, their Party and their candidate if they only had to oppose, say, Rick Perry or Michele Bachmann. That’s because the standard GOP candidate agrees with Obama on many of these issues and is even worse on these others, so progressives can feel good about themselves for supporting Obama: his right-wing opponent is a warmonger, a servant to Wall Street, a neocon, a devotee of harsh and racist criminal justice policies, etc. etc. Paul scrambles the comfortable ideological and partisan categories and forces progressives to confront and account for the policies they are working to protect. His nomination would mean that it is the Republican candidate — not the Democrat — who would be the anti-war, pro-due-process, pro-transparency, anti-Fed, anti-Wall-Street-bailout, anti-Drug-War advocate (which is why some neocons are expressly arguing they’d vote for Obama over Paul). Is it really hard to see why Democrats hate his candidacy and anyone who touts its benefits?