Lehman Brothers collapse is traced back to Fannie Mae and Freddie Mac, the two big mortgage banks that got a federal bailout a few weeks ago. Freddie and Fannie used huge lobbying budgets and political contributions to keep regulators off their backs. A group called the Center for Responsive Politics keeps track of which politicians get Fannie and Freddie political contributions. The top three U.S. senators getting big Fannie and Freddie political bucks were Democrats and No. 2 is Sen. Barack Obama. Now remember, he's only been in the Senate four years, but he still managed to grab the No....