General Discussion

In 2010, my State of Oregon, rather liberal by American standards, had record setting midterm turn out. Some other States had dismal turnouts, but it was the more conservative Democrats that took the big hits, and their districts that had the low turnouts. People don't vote for candidates they don't care for, and that's just politics. The only person to blame when voters do not turn out is the candidate in question, that's politics too.
Your assertion that many people here say they did not vote in 2010 is not something I agree with, I don't see that around here, and you don't cite any examples, of course, you just declare it to be true and proceed to characterize.
The only person I have ever seen say they were not voting in a primary on DU was a poorly informed 'Super Obama Supporter' who thought there was no primary in her State last cycle because Obama was already nominated. 'We don't even have a Democratic primary!' And that is the sort of voter who did not come out in 2010 just as that one skipped 2012, the 'only show for O' crowd and the always hard to book 'youth vote'.
But here, we had huge turn out and will again, our Democrats will run strongly against these proposals by the President. We don't elect all that many Third Way Demopublicans.