What is the burden of good cause to withdraw a plea?

" ' "[T]he withdrawal of [a defendant's] plea rests in the sound discretion of the trial court and may not be disturbed unless the trial court has abused its discretion." [Citation.] An appellate court will not disturb the denial of a motion unless the abuse is clearly demonstrated.' [Citation.] It is the defendant's burden to produce evidence of good cause [to withdraw his plea] by clear and convincing evidence." (People v. Wharton (1991) 53 Cal.3d 522, 585.) Since Abrams did not meet his burden of showing

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