“There is clearly room for bipartisan cooperation,” she said, adding that Mr. Bush appeared to be looking “more at the tax code” as a way of lifting the economy while her package would provide a mix of spending increases and tax relief.

The plan from Mrs. Clinton, Democrat of New York, is the first specific stimulus package to be proposed by a presidential candidate from either party, or by a Democratic leader in Congress, but it is not likely to be the last. Speaker Nancy Pelosi of California has signaled that House Democrats will propose their own stimulus package when they return to Washington next week. Senate Democratic leaders are tentatively talking about something similar.

Brendan Daly, Ms. Pelosi’s spokesman, said Thursday that her proposal had yet to be worked out but that it would be “temporary, timely and targeted” to the middle class, a phrase that has gained currency among many Democrats as they prepare for likely Republican attacks on them as profligate spenders.

President Bush has said he is studying the possibility of a stimulus package that Republicans say would most likely emphasize tax cuts rather than spending. They say Mr. Bush will probably not decide whether to make such a proposal or settle on details until later this month.

Mrs. Clinton has also called for increased spending on energy, housing and other needs over the next several years, paid for by savings elsewhere. But her stimulus package would not be financed by tax increases or other spending cuts.