174
Opinion of the Court
burden of proof; it was at least necessary, to void the conviction, for petitioner to establish that the conflict of interest adversely affected his counsel's performance. The Court of Appeals having found no such effect, see 240 F. 3d, at 360, the denial of habeas relief must be affirmed.
III
Lest today's holding be misconstrued, we note that the only question presented was the effect of a trial court's failure to inquire into a potential conflict upon the Sullivan rule that deficient performance of counsel must be shown. The case was presented and argued on the assumption that (ab-sent some exception for failure to inquire) Sullivan would be applicable—requiring a showing of defective performance, but not requiring in addition (as Strickland does in other ineffectiveness-of-counsel cases), a showing of probable effect upon the outcome of trial. That assumption was not unreasonable in light of the holdings of Courts of Appeals, which have applied Sullivan "unblinkingly" to "all kinds of alleged attorney ethical conflicts," Beets v. Scott, 65 F. 3d 1258, 1266 (CA5 1995) (en banc). They have invoked the Sullivan standard not only when (as here) there is a conflict rooted in counsel's obligations to former clients, see, e. g., Perillo v. Johnson, 205 F. 3d 775, 797-799 (CA5 2000); Freund v. Butterworth, 165 F. 3d 839, 858-860 (CA11 1999); Mannhalt v. Reed, 847 F. 2d 576, 580 (CA9 1988); United States v. Young, 644 F. 2d 1008, 1013 (CA4 1981), but even when representation of the defendant somehow implicates counsel's personal or financial interests, including a book deal, United States v. Hearst, 638 F. 2d 1190, 1193 (CA9 1980), a job with the prosecutor's office, Garcia v. Bunnell, 33 F. 3d 1193, 1194-1195, 1198, n. 4 (CA9 1994), the teaching of classes to Internal Revenue Service agents, United States v. Michaud, 925 F. 2d 37, 40-42 (CA1 1991), a romantic "entanglement" with the prosecutor, Summerlin v. Stewart, 267 F. 3d 926, 935-941 (CA9 2001), or fear of antagonizing the
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