A federal judge Wednesday rejected the argument that his long ago service as an assistant Chicago corporation counsel requires him to step aside from a civil rights lawsuit against the city.In a written opinion, U.S. District Judge Marvin E. Aspen declined to disqualify himself from presiding over a suit alleging Chicago police falsely accused Dexter Taylor of running a stop sign and unlawfully searched his car and seized a firearm.Taylor maintains Aspen is biased against him as a result of his employment by the Law …