Most jurists would see their tenure on the federal bench as the culmination of their careers. Michael P. McCuskey is not like most jurists. After 16 years presiding over cases at the federal courthouse in Urbana, McCuskey said he felt hamstrung by mandatory sentencing guidelines. He was ready to hang up his robes, move back to Marshall County near Peoria and go into private practice or mediation. “I was burned out. I was burned out years ago,” the 66-year-old said this week. But when a vacancy …