Under the economic plan proposed by Democratic presidential candidate, people earning more than $250,000 a year would pay more in taxes while those earning less - the vast majority of American taxpayers - would receive a tax cut.
"We want to take money and put it back in the pocket of middle-class people," Biden said in an interview on ABC's "Good Morning America."
Noting that wealthier Americans would indeed pay more, Biden said: "It's time to be patriotic ... time to jump in, time to be part of the deal, time to help get America out of the rut."
Republican presidential candidatereleased a television ad Thursday charging that Obama would increase the size of the federal government amid an economic crisis. Contending that "a big government casts a big shadow on us all," the ad features the image of a shadow slowly covering a sleeping baby as it exaggerates the reach of the Obama tax proposal.
"Obama and his liberal congressional allies want a massive government, billions in spending increases, wasteful pork," the ad says. "And we would pay - painful income taxes, skyrocketing taxes on life savings, electricity and home heating oil. Can your family afford that?"