Are aging hippie academics becoming "irrelevant"?

"At a time when conservatives dominate all three branches of government and hold an increasingly large share of the Fourth Estate, the academy remains the last liberal stronghold. You would think, then, that liberal intellectuals would offer some thoughtful and productive critiques of conservative policies. But instead, argues one leading liberal intellectual, the academic left is making itself irrelevant by embracing ideological extremism and trying to purge its ranks of those who are not politically correct." "The Collapse of Reason" Boston Globe