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WASHINGTON (WUSA9) -- DC Mayor Vincent Gray sat down with WUSA9's Bruce Johnson for a his first interview as a candidate for re-election.

A host of democrats including four DC Council members are seeking to defeat Gray in the April first primary. They say his 2010 campaign makes him unfit for office.

An investigation by the US Attorney's office into an "off the books campaign" on Gray's behalf has produced four felony guilty pleas.