The Left vs The World?

Freddie deBoer doesn't appreciate the beating the left has been taking:

The Tea Parties don't get exactly what they want, usually. But they steadily and consistently push the conservative movement to the right, and in doing so drag the center with them. That's the salient lesson of the last several years: extremes define the center. Yet liberal bloggers delight in kneecapping the man to their left, while conservatives race to be the man to the right. How could anyone wonder why this results in a steady march rightward? What bothers me is never that liberal bloggers fail to adopt the ideas of the left but always that they don't understand that true left wing voices give them cover and help to establish a middle ground that is conducive to their interests.