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Hi from Just Answer. I'm PDtax, and will assist.
Per the CTA, you can roll your 457 account into an IRA with no tax penalty or cost. I suggest using a new IRA account, so you can keep track of the history of the transfer.
http://ctainvest.org/home/403b-457-Plans/about-457-plans/rolling-over-your-457-plan.aspx is the link to their site discussing the rollover.
Try to do it direct, trustee-to-trustee, so that there won't be any need for withholding.
Thanks for asking at Just Answer. Positive feedback is appreciated. I'm PDtax.