The Professional Left

As a former conservative (and a former leftist; I got around), I have noticed that the mainstream media often use the term "ultra-conservative" but rarely apply any equivalent term to extremists on the Left.  (I use Left/leftist because I mean to reclaim the term "liberal" for libertarians.)  Evidently, there are no left-wing extremists, only right-wing extremists.

But maybe President Obama's press secretary Robert Gibbs gave the mainstream media a term they can use: "the professional left."  Venting about these left-wing extremists in his own party, Gibbs said:

They will be satisfied when we have Canadian health care and we’ve eliminated the Pentagon.

President Obama has repeatedly stated his preference for a single-payer health care system, such as they have in Canada.  Does that make him a semi-professional leftist?