President-elect Barack Obama has boosted plans to kickstart the ailing US economy with an ambitious goal to create three million jobs and unveiled a task force to protect working families.

Several Obama advisors told US media that after a four-hour meeting last week with his economic advisors, Obama added another 500,000 jobs to his plan announced a month ago to create 2.5 million jobs over the next two years.

Faced with fears the United States will now shed some 3.5 million jobs in 2009, driving unemployment rates up from 6.7 percent to above nine percent, Obama decided on a more aggressive strategy, the Washington Post reported.

He plans to hit the ground running when he takes office on January 20, with his economic team already drawing up a huge stimulus package to bring before Congress.

According to US media, Obama''s team is looking to craft a package worth between 675 and 775 billion dollars over two years, but it could swell to 850 billion as it moves through the legislative process. Some news reports have predicted it may even top a trillion dollars.

The US economy has been the foremost concern of Americans for months, as it continues to nosedive despite a 700-billion-dollar Wall Street rescue plan agreed in October.

Vice president-elect Joseph Biden Sunday would not be drawn on precise figures of a second stimulus package.

"What we''re doing is putting together what we think will be the economic package that will do two things. One, stem the hemorrhaging of the loss of jobs, and begin to create new jobs," Biden told ABC''s This Week.

"At the same time, we provide continuing liquidity for the financial markets."

But he admitted that since the Democratic team''s victory in the November 4 election, the economy has turned out to be in much worse shape than previously thought.

"Every economist that I''ve spoken to ... from well-known economists on the right, conservative economists, to economists on the left, and everyone in between, says the scope of this package has to be bold; it has to be big.

"There''s going to be real significant investment, whether it''s 600 billion dollars or more or 700 billion dollars. The clear notion is, it''s a number no one thought about a year ago," Biden said.