President Obama returned Wednesday night to his get-off-your-duffs message, warning Democrats at a low-key million-dollar fundraising dinner against “sulking and sitting back.”

“One of the strengths of Democrats is that we don’t march lockstep. We like to have internal arguments and we’re very self-critical. We tend to look at the glass as half-empty. And that makes us better,” he said to a dining room filled with donors. “But that’s also a weakness, particularly four weeks before an election.”…

“Unless we are able to maintain Democrats in the House and Senate, then we’re going to be stalled for two years or four years, and we’re going to start going backwards,” he said.