“In interviews with nearly two dozen of Mr. Cruz’s former colleagues on the court, many of the clerks working in the chambers of liberal justices, but also several from conservative chambers, depicted Mr. Cruz as ‘obsessed’ with capital punishment. Some thought his recounting of the crimes — ‘dime store novel’ was how one described his style — seemed more appropriate for a prosecutor persuading a jury than for a law clerk addressing the country’s nine foremost judges.”