Whether the Strickland v. Washington two-part test governs ineffective-assistance claims challenging the validity of a guilty plea.
Holding
Yes. A defendant attacking a guilty plea based on ineffective assistance must establish both deficient performance and prejudice under Strickland.
Reasoning
A guilty plea is constitutionally valid when it represents a voluntary and intelligent choice among the alternatives available to the defendant. When a represented defendant claims that counsel made the plea involuntary or unintelligent, the claim concerns whether counsel’s advice fell within the constitutionally required range of professional competence under McMann v. Richardson and Tollett v. Henderson.
Strickland requires a defendant to show that counsel performed below an objective standard of reasonableness and that there is a reasonable probability that the lawyer’s errors changed the result of the proceeding. Although Strickland itself involved a capital sentencing proceeding, the Court held that its two-part framework applies equally to ineffective-assistance claims arising from plea bargaining and plea entry.
The prejudice requirement is especially important because not every professionally unreasonable error affects the judgment. Requiring prejudice also protects the strong interest in the finality of guilty pleas, which resolve the overwhelming majority of criminal cases and should not be set aside for errors that made no practical difference.