Madison, Wis. ? Buck up. Stop whining. And get to work.

Clearly frustrated by Republicans’ energy — and his own party’s lack of enthusiasm — President Barack Obama scolded fellow Democrats even as he rallied them Tuesday in an effort to save the party from big GOP gains in the crucial midterm elections. In the final month of campaigning, he’s trying to re-energize young voters, despondent liberals and other Democrats whose excitement over his election has dissipated.

“It is inexcusable for any Democrat or progressive right now to stand on the sidelines,” the president declared in a Rolling Stone magazine interview. He said that supposed supporters who are “sitting on their hands complaining” are irresponsible because the consequences of Republican congressional victories could be dashed Democratic plans.

He gave an example during a backyard conversation with New Mexico voters, arguing that Republicans would reverse the progress he’s made on education reform and student aid. “That’s the choice that we’ve got in this election,” Obama said, underscoring the stakes of Nov. 2.

Later, at an outdoor rally at the University of Wisconsin in Madison, the president urged thousands of students to stay as inspired and involved in this election as they were two years ago.

“We can’t let this country fall backwards because the rest of us didn’t care enough to fight,” he said to loud applause.

It was the first of four large rallies planned for the campaign homestretch as the president tries to rekindle some of his 2008 campaign magic and fire up young supporters and others who helped elect Obama but who Democrats fear may stay home this fall.