The president and his Democrats are facing voter discontent over an ailing economy and persistently high unemployment.
US president Barack Obama warned on Saturday that Republicans could roll back his agenda if they prevail in Tuesday's congressional elections as he sought to rally Democrats in a final campaign push.
Making his way through a four-state tour, Obama implored Democratic voters to show up in large numbers. Polls show his party is likely to lose control of the House of Representatives to the Republicans and see its Senate majority weakened.
"Unless each and every one of you turn out and get your friends to turn out and get your families to turn out then we could fall short and all the progress that we've made over the last couple of years can be rolled back," Obama told cheering campaign volunteers at his first stop in Philadelphia.
In his hometown of Chicago, a crowd estimated by Democratic officials at more than 30,000 people held signs saying "Vote this Tuesday" and "Moving America Forward."
"We've got a lot of work to do, not only to move the country forward but to make sure that the progress we've made continues," Obama said.
The president and his Democrats are facing voter discontent over an ailing economy and persistently high unemployment.
Republicans have scored points by attacking Obama's agenda, including a healthcare overhaul and huge economic stimulus plan, that they call a government overreach. Loss of the House could stall Obama's legislative efforts.
Representative John Boehner, who would likely be the new speaker of the house if Republicans win a majority, said Obama's agenda had not fixed the country's economic problems.
"These problems didn't start under President Obama. But instead of fixing them, his policies have made them worse," Boehner said in the weekly Republican address.
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