DENVER – Barack Obama and John McCain agree on this much: The economy is staggering under the Bush administration, and Americans are hurting. But who’s to blame and how best to fix it?

Well, they part ways on that, as they made clear in dueling economic speeches Monday on the issue that has taken center stage in their presidential contest.

Obama said that McCain offers “exactly what George Bush has done for the last eight years.”

“The progress we made during the 1990s was quickly reversed by an administration with a single philosophy that is as old as it is misguided: reward not work, not success, but pure wealth,” Obama said. Grounded by plane trouble in St. Louis, he phoned his remarks to a gathering in Charlotte, N.C.

McCain has been forced into a more defensive crouch because his party has held the White House while jobs, home values, stock prices and consumer confidence have tumbled.

While calling Obama’s plans expensive and unwise on Monday, he tried to distance himself from President Bush where he could.

“This Congress and this administration have failed to meet their responsibilities to manage the government,” McCain said in Denver. “Government has grown by 60 percent in the last eight years. That is simply inexcusable.”

He promised to veto “every single bill with wasteful spending.”

McCain has said the economy is not his strong suit, and on Monday he seemed eager to show a deeper understanding of the topic, even as he dismissed experts.

“Some economists don’t think much of my gas tax holiday,” he said of his plan to temporarily suspend the federal levy on motor fuels. “But the American people like it, and so do small business owners.”

Obama calls that plan a gimmick that will not lower gasoline prices.

The Democratic senator favors tax cuts for middle-class workers and tax increases for top earners. He calls for substantial government subsidies for health care, college, retirement and alternative energies.

McCain pledges to cut taxes for all and raise them on none. Government should shrink, not grow, he told his audience in Denver.

From a political standpoint, Obama’s selling job would seem easier. McCain has linked himself in many ways to the struggling administration, including his call to continue Bush’s first-term tax cuts, which he initially opposed.

A recent poll by Democracy Corps, which is run by Democratic strategists, suggests that voters are very much up for grabs on economic issues.

Asked to react to descriptions of the candidates’ economic plans, 50 percent said their views more closely resembled McCain’s goal of cutting taxes for the middle class and for businesses, simplifying the tax code, maintaining free trade and eliminating government waste.

Forty five percent said their views more closely resembled Obama’s goal of cutting taxes for 95 percent of American families, eliminating special tax breaks for big corporations, renegotiating trade treaties, creating jobs by investing in research and education and in new energy sources.

At the same time, 49 percent said their views closely tracked Obama’s portrayal of McCain’s economic plan as a continuation of “the failed policy of George Bush.” Four out of ten said their views were closer to McCain’s claims that Obama’s plan calls for up to a trillion dollars in new taxes as well as “a massive increase in federal spending, including a federal takeover of health care.”

Obama renewed his call Monday for a $50 billion “second stimulus package that provides energy rebate checks for working families, a fund to help families avoid foreclosure, and increased assistance for states that have been hard-hit by the economic downturn.”

He said he would eliminate income taxes for retirees making less than $50,000 a year. People still working, he said, would be automatically enrolled “in a workplace pension plan that stays with you from job to job. And for working families who earn under $75,000, we will start that nest egg for you by matching 50 percent of the first $1,000 you save and depositing it directly into your account.”

McCain’s plans include doubling the child tax deduction from $3,500 to $7,000 “for every dependent.” He also cited his plans to cut the estate tax, although Democrats note that it applies to few Americans.

McCain would provide refundable tax credits of $2,500 for individuals, and $5,000 for families, for all those who buy health insurance. Employer contributions toward health insurance would be treated as income, meaning workers would have to pay income taxes on it, but not payroll taxes.

Obama says that plan would seriously undermine the employer-based system that provides health insurance to about 158 million workers. He would require most employers to provide health care for their workers or pay into a national health care plan.

McCain said Obama’s plan would hurt small businesses and hamper job creation.