Disney does offer a 4-day park hopper pass. There is no DC discount on it, however.
According to Ded Wills' site an adult 4-day PH is $204.49 ($161.89 for a child) if purchased in advance (like thru the Disney.com website or at a local DisneyStore). At the gate it will cost you $211.95 (adult) and $169.35 (child).
You might do better purchasing thru one of the online brokers like Ticketmania or Paramount.
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