Young voters were enthusaistic about voting for President Obama in 2008, but a new Gallup survey finds that excitement for heading to the polls may have dissipated this year. That hasn't gone unnoticed at the Democratic National Committee and Obama's Organizing for America, which e-mailed a video of Obama spelling out the importance of the midterm elections.

"Today, the health insurance companies, the Wall Street banks, and the special interests who have ruled Washington for too long are already focused on November's congressional elections," Obama says in the video. "So this year I need your help once more. ... It will be up to each of you to make sure the young people, African Americans, Latinos and women who powered our victory in 2008 stand together once again."

Young voters offered a huge boost to Obama in 2008, when 18-29-year-olds made up nearly a fifth of the electorate and voted 66 percent for Obama. Up a level, 30-44-year-olds voted 52 percent for Obama and accounted for 29 percent of the electorate.

Perhaps troublesome for congressional Democrats running for re-election, Gallup's survey finds that significant portions of both voting blocs are less than enthused to vote again this year.

In the under-30 bloc, 23 percent is very enthusiastic about voting this year, 28 percent somewhat enthusiastic and 47 percent not enthusiastic. Meanwhile, 30-49-year-olds are only slightly more excited: 32 percent are very enthusiastic, 26 percent somewhat enthusiastic and 41 percent not enthusiastic.

The youngest voting bloc is important for Democrats, even if Obama is not on the ticket. Gallup found that 51 percent would support the Democrat running in their district, while just 39 percent would vote for the Republican. That's the only one of the four age-specific voting blocs that Democrats currently lead.

The fact that young voters lean Democratic and aren't excited to vote is not unsurprising or much different from some recent elections, but "The current data confirm that at this juncture, both of these patterns continue to play out in this year's midterm elections," writes Gallup's Frank Newport. "Democratic leaders have apparently recognized these realities, and are attempting to re-create the enthusiasm for Democrats among younger voters that was apparent in 2008."