Govenor Walker is not issuing pardons. It is possible that the case could be reopened or reduced but it depends on the Judge and the prosecutor on the case whether they will entertain such a motion.
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Expungement is not legally possible in your case.
This answer is provided for general information only. No legal advice can be given without a consult as to the specifics of the case.
While you could make an argument for expunction, such an argument is unlikely to be successful given the following recent Court of Appeals case: