When can a coram nobis petition allege ineffective assistance of counsel?

When a coram nobis petition alleges ineffective assistance of counsel, Strickland v. Washington, 466 U.S. 668 (1984), applies, and the petition must therefore prove that: (1) counsel's performance was objectively unreasonable; and (2) the deficient performance prejudiced the petitioner. To establish prejudice resulting from an attorney's error, a petitioner must prove there exists "a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different." Id. at 694.

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