Stankewitz v. Woodford, 365 F.3d 706 (9th Cir.), cert. den., 125 S. Ct. 517, 160 L. Ed. 2d 369 (2004) (evidentiary hearing required on claim of denial of effective assistance of counsel based on counsels failure to "investigate and introduce available, vital evidence of [defendants] childhood of abuse, poverty and institutionalization; his mental deficiencies amounting to borderline retardation; and his drug and alcohol abuse exacerbating his disturbed emotional state, particularly in the days leading up to the killing.").