Federal prosecutors are seeking a sentence of 17 to 21 years for a former Pennsylvania congressman convicted of a racketeering scheme that included a string of illicit financial moves to cover up an illegal $1 million campaign loan. Eleven-term Philadelphia Democrat Chaka Fattah is scheduled to be sentenced Monday, the denouement of a 30-year political career that took him on Air Force One and to a seat on the powerful House Appropriations Committee.