You can get the misdemeanor expunged. You have to file a motion with the court and it will be removed, however certain agencies have access to expunged records. This appears to be a minor misdemeanor and may not have made it on to your permanent record.
if you would like I can help you for a modest fee. Feel free to contact me 216-316-3161
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You should be able to get this charge expunged, as long as the State does not object. Since Obstructing Official Business is a misdemeanor of the second degree in Ohio, you only needed to wait one year from the termination of your case to file.
However, you need to be aware that if you are going to be working in a field that involves patients, children or students, your expungement will probably have no relevance, as employers in these types of professions will be able to locate the conviction. I had a past client that found this out the hard way.
There are rehabilitation standards that may allow you to teach if you meet them. Here is a link to the specific Ohio Administrative Code that applies: http://codes.ohio.gov/oac/3301-20-01.
You may be considered rehabilitated because the misdemeanor is more than five years old. You may also be considered rehabilitated if you have the record expunged. You should consult with a local attorney to apply to have the record expunged.