"mitigating evidence" not constitutionally required to be defined more broadly than that evidence "which reduces a defendant's moral blameworthiness” | “mitigating evidence” not constitutionally required to be defined more broadly than that evidence “which reduces a defendant’s moral blameworthiness” | "mitigating evidence" not constitutionally required to be defined more broadly than that evidence "which reduces a defendant's moral blameworthiness" | trial court does not abuse its discretion to exclude execution-impact testimony | trial court does not abuse its discretion to exclude execution-impact testimony | trial court does not abuse its discretion to exclude execution-impact testimony | trial court does not abuse its discretion to exclude execution-impact testimony