What is the test for alleging bias or prejudice against a judge?

Under section 144, a party must file a timely affidavit setting forth facts and reasons for the belief that bias or prejudice exists. See 28 U.S.C. Sec. 144. An affidavit filed pursuant to section 144 is not legally sufficient unless it specifically alleges facts that fairly support the contention that the judge exhibits bias or prejudice directed toward a party that stems from an extrajudicial source. See United States v. Sibla, 624 F.2d 864, 868 (9th Cir.1980) (citations omitted).