Admitting his re-election is "not a slam-dunk," President Obama today asked supporters to stick with him in 2012 because "this is going to be tough."

"It's understandable if people aren't feeling as chipper as they were back in 2008," given the state of the economy, the president said.

"There's going to be some skepticism. There's going to be some pushback," Obama told members of his campaign's National Finance Committee.

"Back in 2008, we used to talk about this being a historic moment for America, that we were at a crossroads in our history. Well, we haven't fully crossed the road, and in some ways, 2012 is even more important than it was four years ago," he said. "The choices could not be starker. The vision about where we want to take the country could not be more different."

The president said the vision he outlined in a speech last week in Osawatomie, Kan., for "a country that's based on everybody having a fair shot" will be central to his 2012 campaign.

"It's not a few of us doing well and then the rest of us hoping that we get lucky, but rather, everybody, as a team, moving this country forward," Obama said. "And that vision, in contrast to a vision that basically says you are on your own, is what this election was about in 2008; it's what this election is going to be about in 2012."