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Hi and welcome to JA. Ray here to help you today.Please bear with me a few moments while I review your question and respond.
You can file a defamation suit in federal court assuming there is diversity of parties as you state.http://uscode.law.cornell.edu/uscode/html/uscode28/usc_sec_28_00001332----000-.html
As long as you sue here for $75k you can file such a suit here for defamation.
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