WASHINGTON (WPVI) -- Convicted ex-congressman Chaka Fattah of Philadelphia has been cleared of four of 22 counts of his corruption case based on post-trial motions.Fattah was convicted in June of orchestrating several fraud schemes to raise money for his campaign and personal spending. Several aides and advisers were also convicted.His lawyers argued that a Supreme Court decision later narrowed the definition of bribery.However, U.S. District Judge Harvey Bartle found that Fattah took "extraordinary" steps to seek an ambassadorship for a friend who had given him money, even hand-delivering a letter to President Barack Obama.But the judge agreed in Thursday's ruling to acquit Fattah of four bank and mail fraud counts.The 11-term Democrat does not yet have a sentencing date.Defense lawyers did not immediately return messages seeking comment.