Porter v. McCollum
Facts
At the penalty phase of Porter's capital trial, standby counsel was appointed about a month before sentencing and presented almost no mitigating evidence beyond limited testimony from Porter's ex-wife and a deposition excerpt. In later postconviction proceedings, Porter introduced substantial evidence that counsel had not uncovered, including severe childhood abuse, distinguished and traumatic combat service in Korea, long-term substance abuse, brain damage, cognitive defects, and mental-health impairment. Counsel had not obtained Porter's school, medical, or military records, interviewed family members, or meaningfully investigated mental health mitigation. The Florida courts concluded Porter was not prejudiced by any deficiency, despite the Florida Supreme Court's earlier removal on direct appeal of one aggravating factor for the murder sentence that resulted in death.
Issue
Whether the Florida Supreme Court unreasonably applied Strickland in concluding that Porter was not prejudiced by counsel's failure to investigate and present substantial mitigating evidence at the capital penalty phase. Also, because the state court did not decide deficiency, whether counsel's performance was constitutionally deficient.
Rule
Under Strickland, counsel is ineffective if representation falls below an objective standard of reasonableness and there is a reasonable probability that, but for counsel's errors, the result would have been different. In evaluating prejudice at capital sentencing, a court must consider the totality of available mitigating evidence, including evidence presented later in postconviction proceedings, and reweigh it against the aggravating evidence; under AEDPA, relief is warranted when the state court's rejection of the claim is contrary to or an unreasonable application of Strickland, or rests on an unreasonable determination of the facts.
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If Nolan later seeks habeas relief, which is the strongest argument that counsel performed deficiently?