FACTBOX - Details of possible U.S. economic stimulus bill

(Reuters) - President-elect Barack Obama sought to rally support on Thursday for a massive fiscal stimulus package, warning the U.S. recession could stretch on for years unless dramatic action is taken.

Obama is pressing leaders in the U.S. Congress to craft legislation that will combine emergency spending by the federal government and tax cuts to create or save 3 million jobs and put more money in people's pockets to spend on consumer goods.

Following is a list of what could be key elements of the legislation, although significant changes could occur before the House of Representatives and Senate vote on a bill:

* THE PRICE TAG: Obama officials and Democrats in Congress have been talking about spending $675 billion (445 billion pounds) to $775 billion over two years. Some U.S. governors and economists are pushing for even more -- around $1 trillion. Many Republicans want less, maybe in the range of $500 billion.

* PRICE COMPARISON: Washington spends about $1 trillion every year on all government activities, except for Social Security, Medicare, Medicaid and some other "entitlement" programs that together cost about $2 trillion a year. About $850 billion has been spent on the wars in Iraq and Afghanistan over the past eight years.

* WHEN IT WILL HAPPEN: Even though Democrats had hoped to present Obama with a bill to sign into law on his first day in office, January 20, mid-February now looks more realistic. Obama fears delay could deepen the recession and bring double-digit unemployment. The jobless rate nationally is now 6.7 percent.

* WHERE THE MONEY WOULD BE SPENT: Democrats want to undertake major road, bridge, transit and other public works projects, to mend crumbling infrastructure and quickly create new construction jobs. Obama also wants to spend to help the healthcare industry create electronic medical records. Well over $100 billion could be spent on the various projects.

-- Other likely recipients: States want $250 billion to help pay the rising costs of Medicaid health insurance for the poor and other services amid falling revenues. Republicans have suggested these funds be provided as loans rather than grants.

-- Billions of dollars could be spent on helping more poor people buy food and pay heating costs, along with extending benefits for the increasing number of jobless people.