Criticized for zealously defending a cop killer, President Barack Obama’s beleaguered nominee to lead to the Justice Department’s civil rights division has withdrawn his nomination. The law firm of WilmerHale said Debo Adegbile has returned to private practice in its New York office. The White House confirmed that Mr. Adegbile withdrew his nomination. The Senate blocked Mr. Adegbile’s nomination in March, with critics citing his representation of Mumia Abu-Jamal, who was convicted 30 years ago of murdering a Philadelphia police officer. As the former head of the NAACP Legal Defense Fund, Mr. Adegbile helped Abu-Jamal get his death sentence overturned....