President Barack Obama wraps up a four-state tour Wednesday with stops in Des Moines, Iowa and Richmond, Va.
On Tuesday, he spoke at the University of Wisconsin - Madison, a liberal stronghold. He's trying to re-ignite the enthusiasm of his 2008 drive to the White House.
"Get out there and shape it, fight for it," Obama told the audience. "We need you to pledge to vote, knock on doors. Bring energy and passion and commitment."
Although two-thirds of young voters supported Obama in 2008, the enthusiasm has dwindled down this year.
In an interview with Rolling Stone Magazine, the president told Democrats to wake up. Also this week, Vice President Joe Biden told the base to "stop whining" and "buck up."
Some Democrats said this approach could backfire.
"He is telling voters on the Democratic base that they are irresponsible, that you know they're slackers, that they don't care enough to show up," said Jane Hamsher, co-founder of the liberal blog FireDogLake.