By David Alexander

WASHINGTON, Jan 24 (Reuters) - President Barack Obama pledged on Saturday to create jobs, improve healthcare and lay the groundwork for a clean energy future as he sought to build public support for an $825 billion stimulus plan some lawmakers fear is too costly.

Saying more people filed for unemployment this week than at any time in the past 26 years, Obama warned in his weekly radio address that joblessness could hit double digits and the economy could fall $1 trillion short of its full capacity if nothing was done.

"If we do not act boldly and swiftly, a bad situation could become dramatically worse," the new U.S. president said in his first weekly radio address. He said he expected to sign an economic recovery plan into law within a month.

The White House said a report outlining the impact of the stimulus plan would be put on its website, www.whitehouse.gov, at 6 a.m. (1100 GMT) on Saturday. Aides said the report began to put "meat on the bones" of Obama's previously stated goals.

Obama took office on Tuesday with the United States in its worst economic crisis since the Great Depression. The radio address on Saturday continued the push he began this month to win quick congressional approval of the $825 billion spending bill he hopes will lift the economy out of recession.

Obama met with Republican and Democratic leaders at the White House on Friday and planned to meet Republican lawmakers on Capitol Hill on Tuesday in a bid to build consensus for the stimulus and bridge the partisan divide that has divided Washington for years.

ENERGY EFFICIENCY

He said in his radio address the economic recovery plan would save or create 3 million to 4 million jobs while investing in priorities like clean energy development, education and improving healthcare efficiency.