Why The Left Runs To The "Center"?

Here's an insightful post that builds on Greenwald's latest and asks why Weakness is Strength for Dems. The answer is intriguing, although I'm not sure I buy the entire premise; I guess I have a hard time believing that today's media stars are that influential with voters, but then again for the premise to work, they only need to be influential to candidates and their advisers. The concept of "moving to the center" is summed up nicely with this line:

The entire construct is based upon Democrats distancing themselves from their most ardent supporters (which is quite convenient for Republicans.)