President Obama and first lady Michelle Obama appeared in a video released Tuesday, urging their supporters to volunteer the weekend before Election Day on Nov. 2. 

The video was cut for Organizing for America, an offshoot of Obama's grassroots political operation that helped propel him to victory in 2008. Both Obamas urged supporters to sign up for shifts making phone calls and getting voters to polling places.

"We need you to stay fired up all the way to Nov. 2," the president said.

"Each of you can make a difference. We have seen it before, we know we can do it again," the first lady added. 

The video is yet another sign Democrats are keying in on their base supporters to help keep the congressional majorities intact against an expected Republican wave.

President Obama has appeared at a number of highly-attended rallies intended to drum up enthusiasm among young voters, a key constituency for Obama in 2008 that some political strategists believe could turn out in lesser numbers in 2010.

The popular first lady has also figured into the Democrats' campaign strategy — she recently appeared on behalf of Sen. Russ Feingold (D-Wis.), who faces a tough reelection battle. The Obamas also appeared together at a rally in Cleveland this week for their first joint campaign appearance on the 2010 campaign.