Former Attorney General Martha Coakley is extracting herself from the Suffolk University presidency crisis, saying she will not be a candidate for the top job.Coakley was being talked about as a replacement for embattled Suffolk President Margaret McKenna."I would like to clarify that I am not a candidate for the role of president of Suffolk University nor will I be and I look forward to continuing my law practice at Foley Hoag," Coakley said.