According to an administration official, Mr. Obama will kick off his new offensive in Las Vegas, ground zero of the housing bust, by promoting new rules for federally guaranteed mortgages so that more homeowners, those with little or no equity in their homes, can refinance and avert foreclosure.

And Wednesday in Denver, the official said, Mr. Obama will announce policy changes to ease college graduates’ repayment of federal loans, seeking to alleviate the financial concerns of students considering college at a time when states are raising tuition.

The president’s announcements will bookend a three-day Western trip during which he also will hold fund-raising events in the two cities — both Nevada and Colorado are election battlegrounds — as well as in Los Angeles and San Francisco.

The “We can’t wait” campaign is a new phase in Mr. Obama’s so-far unsuccessful effort — punctuated until now by his cries of “Pass this bill!” on the stump — to pressure Republicans to support the job creation package he proposed after Labor Day. It comes after unanimous votes by Senate Republicans in the past week to block the plan; House Republican leaders have refused to put the measure to a vote.

Polls show overwhelming support for pieces of the $447 billion package, which includes expanded tax cuts for workers and employers, and spending for infrastructure projects and for state aid to keep teachers and emergency responders at work. But Republicans oppose provisions in Mr. Obama’s plan that would offset the costs with higher taxes on the wealthy.

Should the bill ultimately fail, Democrats believe they at least have the better political argument, and they vow to exploit what they call the Republicans’ obstruction in the 2012 campaign.

Yet any political benefit would be small consolation for the White House, given the forecasts of nonpartisan economists that without such a stimulus plan, the economy is likely to relapse into recession next year just as the president faces re-election.

“The only way we can truly attack our economic challenges is with bold, bipartisan action in Congress,” said Dan Pfeiffer, Mr. Obama’s communications director. “The president will continue to pressure Congressional Republicans to put country before party and pass the American Jobs Act, but he believes we cannot wait, so he will act where they won’t.”

Privately, some Republicans worry that they could suffer from that line of attack. On Sunday the Senate Republican minority leader, Mitch McConnell of Kentucky, offered an alternate narrative, saying that Mr. Obama, for all his complaints about Republican opposition, had given little prominence to his signing of three free-trade agreements that won bipartisan approval this month.

“They’re ashamed to mention any of the things that they do with Republicans because it steps on their story line,” Mr. McConnell said on the CNN program “State of the Union.” “Their story line is that there must be some villain out there who’s keeping this administration from succeeding.”

By resorting to executive actions, using his wide-ranging authority to oversee federal laws and agencies, Mr. Obama seems intent on showing that he is not powerless in the face of Republican opposition but is trying to strengthen the economy and help Americans in trouble.

Aides said Mr. Obama would announce at least one initiative each week through the rest of the year, including steps to help returning veterans and small businesses. Yet the officials acknowledge that the coming policy changes, executive orders and agency actions are generally less far-reaching than the legislative proposals now before Congress.

Recent executive actions provide examples of what is to come.

This month the administration expedited approval of payments to small businesses with government contracts. It announced waivers for states with schools falling short of the proficiency standards of the 2002 No Child Left Behind education law — a move that prompted some senators to compromise on an alternative rewrite of the law.

And last week the administration eased regulations stemming from the 2010 health insurance law to encourage hospitals and doctors to coordinate on Medicare patients’ care for better results at lower cost.

The housing proposal that Mr. Obama will announce in Las Vegas is rooted in the independent Federal Housing Finance Agency, the office created to oversee the government-sponsored housing finance companies Fannie Mae and Freddie Mac after they were forced into conservatorship at the outset of the financial crisis in 2008.

Though the collapse of housing values is considered a major factor holding back economic growth, because of its effect on consumer spending, government programs to stem foreclosures have fallen short of initial promises. For that reason, officials have tried not to raise expectations that the latest plan can help more than a small fraction of the millions in danger of foreclosure.

While details remain sketchy, the initiative is expected to change eligibility standards for the three-year-old Home Affordable Refinance Program to encourage new, lower-cost loans to more homeowners who owe more on their mortgages than their properties are worth.

Typically, refinancing is unavailable to those who do not have equity in their houses; the Home Affordable Refinance Program sought to encourage refinancing for up to 125 percent of a home’s value for mortgages owned or guaranteed by Fannie Mae or Freddie Mac. This month the acting director of the Federal Housing Finance Agency, Edward J. DeMarco, told lawmakers his agency was considering raising that threshold.

Vice President Joseph R. Biden Jr., in a CNN appearance on Sunday, said the administration would continue to work with federal agencies “to loosen restrictions on the ability to refinance” and also press the banks, “so they can get in the business of actually doing what we think they should have been doing much more of, and that is sitting down and renegotiating with people who are about to go under.”

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