(I'm not a Dem, but I usually vote with them)
Were Democrats having bad day on election day in November 2010? Did they have an array of hopeless candidates, each more abusive or nuttier than the rest? Did they have unelectable candidates that were still the main attraction in the 24/7 news cycle? Were they proposing legislation in many states to disenfranchise voters? Were they proposing legislation to make women 2nd class citizens?
Democrats, perhaps from some funky mix of lethargy and overconfidence, just plain did not go out and vote. For this, we got shocked toward banana republic political status, retreating on the economy when we should have been charging forward, and let union workers, teachers, firefighters, homeowners, etc., be blamed for what Wall Street did to the Global economy.
The lesson, today, whether we vote to repeal union-busting in OH or vote to declare zygotes persons, is that if we don't vote, things will change. Not for the better.