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You will have to be more specific. I think you are lamely referring to the voter rights act, specifically section 5, where certain jurisdictions and states had to get permission to change voting rules. This stems from the voter rights act of 65 and most of the jurisdictions covered were democrat at the time.
For your edification, if you bother to read it:
http://www.washingtonpost.com/wp-srv/special/politics/section-five-voting-rights-act-map/