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Is the current First Vice-Chair of the Arkansas Democratic Party 
Elected to the DNC in 2001
She was a Delegate to the Democratic National Convention from Arkansas in 2000 and 2004
She has campaigned for most Democrats running in Arkansas, including Mark Prior and Branch Lincoln (from interview)
She's a member of the Democratic National Committee from Arkansas as of 2004
Is a member of the Arkansas Women for Hillary Council.
Info from a Clinton media release: "Members of the Arkansas Women for Hillary Council will join Hillary for a conference call this week. They are encouraged to be ambassadors for Hillary by reaching out to their networks on Hillary's behalf while also educating and empowering others to make history by making Hillary our 44th President." 
She has endorsed Hillary Clinton (update: in her interview she stated she will support Hillary all the way to the convention, even if Obama ends up with more pledged delegates)
DemConWatch - A very comprehensive list of superdelegates and known commitments. Please use this as a starting point and double check by doing a news search to make sure the data is accurate. If you have a tip, let them know.
WashingtonPost.com - Web site with full listing of superdelegates broken out by state and then type.