That's about 30 million Americans who are without jobs or unable to find full-time work. "Underemployed people spent 36 percent less on household purchases than their fully employed neighbors in January, while six out of 10 were not hopeful about their chances of finding adequate work in the coming month, the poll said," Reuters reported.

"The poll comes at a time when voter anger over the slow economic recovery is running high and President Barack Obama's hopes of boosting employment through government programs have been frustrated by partisan rancor in Congress."

The poll, which has only a single percentage-point margin of error, also found that underemployed Americans have a more favorable view of the president than those with full-time work.