Senator and presidential aspirant John McCain (R-AZ) gives back $20,000 in donations from two brothers who once bankrolled "dirty tricks" against him. The Congressional Black Caucus is "on the verge of open revolt" because the House Democratic leadership is "picking on" Rep. William Jefferson (D-LA), whose offices were raided last weekend by the FBI. And Cheney may testify in the Scooter Libby Trial. We're firing on all cylinders in today's Daily Muck.