(Reuters) - U.S. President George W. Bush has proposed a $150 billion (76.7 billion pound) plan to help stimulate the ailing economy.

Worries that a recession may be looming have prompted several of the candidates in the U.S. presidential race to unveil plans to give the economy a lift. Here are their ideas:

DEMOCRAT HILLARY CLINTON

The New York senator has proposed a $70 billion package to stave off a possible recession, including $40 billion in spending for heating assistance, an extension of unemployment insurance and investments in energy efficiency.

The other $30 billion would go toward helping low-income families hit by the mortgage crisis.

A second phase of the package, which would total an additional $40 billion, would be triggered if the economy failed to respond. That would pay for tax rebates for low- and middle-income workers.

DEMOCRAT JOHN EDWARDS

The former senator from North Carolina has proposed a $25 billion job creation plan with the possibility of $75 billion more if there is more evidence the United States is entering a recession.

The plan calls for investing in clean energy infrastructure, increasing federal aid to help states avoid cutting programs that help families through hard times, reforming unemployment insurance and tackling housing crisis.