I'm guessing Markos isn't snowed under with his book anymore, because he made some excellent points over at dKos today:
I wrote above that most progressives "agree on most things", but there are probably few issues, if any, in which 100 percent of progressives agree. And such disagreements are not necessarily born of ignorance, or "using Rove's talking points", or being a "DINO". But disagreements born from research and exploration and each individual's varied life experiences. This is a reality in which we must operate and thrive, and it can't be by forcing a party line on every single issue. Because really, who will set the party line? Who will enforce it?
