A return to civility? As you pointed out, civility requires the participation of both sides. When were the Democrats and their nutcase parasite allies in the media and Hollywood and the anti-whatever movements EVER civil to or about Bush? When did they let a minute go by without demonizing Cheney? Bush never struck back and the country is now suffering for it. At this point I expect every Republican with vocal chords to be remorseless — both with criticism and ridicule. No administration has ever so richly deserved it as the smugly incompetent current one. Civility will only return after they have cried uncle.
I'm repeatedly astonished that many posters here don't have a clue about the nature of the Opposition. Civility isn't in the Left's vocabulary as you point out! Its motto is "By any means necessary."
I'm re-reading Horowitz's "Radical Son" and came across a relevant quote from "New Left Notes" published by the Students for a Democratic Society (a title that vies with People for the American Way for a Nobel in cynicism).
"You have to realize that the issue didn't matter. The issues were never the issues. You could have been involved with the Panthers, the Weatherpeople, SLATE, SNCC, SDS. It really didn't matter what. It was the revolution that was everything...That's why dope was good. Anything that undermined the system contributed to the revolution and was therefore good."
Today's Democrat Party is just a continuation of the Marxist revolution that began in the 60s. Its goal -- as embodied by Obama and his co-conspirators in Congress -- is to undermine and destroy the American system.