In the early 1990's the whole term and backlash against being "politically correct" was unleashed by the right, to devastating effect.
The term was tailor made for straight, white, working class men who grew tired of all the new sensitivities they were supposed to employ toward women and minorities.
The widespread use of the term fractured our working class base and struck right at the heart of what kos points out about the Dem party in his post today: the Party had become bloated by special interests with an agenda other than party building. Rush Limbaugh made a fortune on that "PC" idea, and it helped him pay for drugs.
But now "PC" is stale. What we now face is "religious correctness," and for precisely the same reasons, in mirror image. So start using the terms "religious correctness" and "RC" today. Work it into your every diary, and your conversations: let's see how powerul we are in shaping the lexicon and defining the terms of the debate. Let's take down the insufferable theocratic facsists and hypoctics with just a couple of words.