Cite as: 506 U. S. 20 (1992)
Opinion of the Court
not obvious to us that, once a State assigns the government the burden of persuasion, requiring anything less than clear and convincing extrinsic evidence is fundamentally unfair. Again, we are pointed to no historical tradition setting the standard of proof at this particular level. And contemporary practice is far from uniform; state courts that impose the ultimate burden on the government appear to demand proof ranging from preponderance, see Triptow, supra, at 149; Watkins, supra, at 837, to beyond a reasonable doubt, see Hennings, supra, at 382, 670 P. 2d, at 257. We are therefore unprepared to say that when the government carries the ultimate burden of persuasion and no transcript of the prior proceeding exists, the Due Process Clause requires the Commonwealth to prove the validity of the conviction by clear and convincing extrarecord evidence.
III
Respondent no longer challenges the validity of his 1979 plea. Thus, the final issue before us is whether the Kentucky courts properly concluded that respondent's 1981 guilty plea was valid. For the proper standard of review, petitioner cites Marshall v. Lonberger, 459 U. S. 422 (1983), a case quite similar to this one. In Lonberger, the state defendant challenged a prior conviction used to obtain a death sentence on the ground that the conviction was based on a guilty plea invalid under Boykin. We held that although "the governing standard as to whether a plea of guilty is voluntary for purposes of the Federal Constitution is a question of federal law," 459 U. S., at 431, questions of historical fact, including inferences properly drawn from such facts, are in this context entitled to the presumption of correctness accorded state court factual findings under 28 U. S. C. § 2254(d), Lonberger, supra, at 431-432; cf. Miller v. Fenton, 474 U. S. 104, 113, 115, 117 (1985) (holding that the question whether a confession is voluntary is subject to independent federal determination, expressly distinguishing Lonberger).
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