The following excerpt is from Morris v. Woodford, 273 F.3d 826 (9th Cir. 2001):
When considering an allegedly erroneous jury instruction in a habeas proceeding, an appellate court first considers whether the error in the challenged instruction, if any, amounted to "constitutional error." Calderon v. Coleman, 525 U.S. 141, 146 (1998). If so, the court then considers whether the error was harmless. Id. at 145, 119 S. Ct. 500.
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