Following on the Sagan quote from Demon-Haunted World, a link to why Krugman is right, and Obama is wrong seems appropriate. The punchline, in response to Obama’s conciliatory stance of bipartisanship:
Anyone who thinks that the next president can achieve real change without bitter confrontation is living in a fantasy world.
Put another way – we need liberals and progressives with backbones, not liberals who compromise their principles. If the conservatives wish to change their stance, and listen to reason, liberals and progressives will be there to listen.
On the other hand, for whatever reason, those on the left tend to be more tolerant of alternative ideologies. It’s in our nature to try to cooperate, be inclusive, etc. Acting like fascists is a right-wing authoritarian trait.
Do we really want a progressive politician to be non-inclusive, just so he can be inclusive?? It’s a paradox that we might just need.