With Congressional midterm elections looming, the financial debate in Washington this fall will probably be consumed by one incendiary and expensive issue: whether, and how, to extend the multitrillion-dollar Bush tax cuts.

President Obama is advocating a mixed bag of tax proposals. He wants to extend the cuts for all but the wealthiest 2 percent of Americans and offer businesses hundreds of billions in breaks and write-offs intended to encourage investment and hiring.

Republicans, and a few Democrats, assert that the Bush tax cuts should be extended for everyone, warning that a tax increase right now, even if limited to the highest income bracket, would hurt small businesses and choke off an economic recovery that is already gasping.

Given the economy’s persistent weakness and an unemployment rate hovering above 9.5 percent, those arguments have gained traction. And because another round of government stimulus spending is considered politically unviable even if it were warranted, the debate over the tax cuts will be laced with promises to spur economic activity and reduce unemployment. The concept of lower taxes is so appealing to voters that many embrace them as an economic cure-all.