Matt Stoller has a great series of articles comparing the Netroots Left with the 1960's Left. Here's a quote from the latest
Second, in terms of capturing the political system, the New Left, the liberals, and radical organizers of the 1960s failed, and the New Right of that period won. Culturally it's a very different story (they lost, we won), but institutionally speaking right-wingers have as much or more power than they did in the 1960s, though it's manifested less through cross-burning and more through extreme ghettoization, inequality, a fear-based health care system, and radically higher economic risk for the middle class. We can't pretend that this isn't the case just because it makes the right feel good. The 1960s left lost, and politically speaking in terms of strategy they should NOT be emulated.