Representative Barney Frank is one of the most powerful Democrats in the House of Representatives. As chairman of the Financial Services Committee, he's overseeing the spending of hundreds of billions of dollars to bailout Wall Street and stave off the mortgage crisis. The White House needs him, and he's been a dependable ally so far. Now he's leaning on President Barack Obama to cut the Pentagon budget.On Tuesday, two days before Obama presents a proposed budget to Congress, Frank (D-Mass.) and other House Democrats called on the Obama administration to reduce military spending, setting up a potential clash between House liberals and the White House. At a White House summit on fiscal responsibility the day before, Obama had cast doubt on the future of an $11.2 billion project to upgrade the fleet of presidential helicopters. But Obama has shown no indication that he plans to reduce, or even freeze, overall defense spending, which will be around $650 billion this fiscal year.