PHILADELPHIA — Bill Cosby has hired Michael Jackson’s former lawyer to represent him at his November retrial on sexual assault charges in Pennsylvania. Cosby’s spokesman announced Monday that the 80-year-old comedian is bringing in Tom Mesereau to lead a retooled defense team. Lawyers from the first trial in June had said they wanted off the case. Mesereau won an acquittal in Jackson’s 2004 child molestation trial.