It’s themselves.

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 [Ron] 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….

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?

Read it all here.