U.S. District Judge Andrew Guilford denied that motion, along with two others aimed at undoing the verdict.
The case against Carona followed a long federal investigation. Prosecutors had accused Carona had named millionaire businessman Don Haidl to the post of assistant sheriff in exchange for gifts worth hundreds of thousands of dollars.
January, a federal jury found Carona guilty of witness tampering, and acquitted him of five other felony counts, including conspiracy and mail fraud.
The probation department has recommended a prison sentence of 6.5 years in prison for Carona. Sentencing is scheduled to take place April 27.
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