Obama in Rolling Stone:

The idea that we’ve got a lack of enthusiasm in the Democratic base, that people are sitting on their hands complaining, is just irresponsible.... We have to get folks off the sidelines. People need to shake off this lethargy, people need to buck up. Bringing about change is hard -- that’s what I said during the campaign. It has been hard, and we’ve got some lumps to show for it. But if people now want to take their ball and go home, that tells me folks weren’t serious in the first place. If you’re serious, now’s exactly the time that people have to step up.