"Logistics became a challenge" translation: the DNC host committee had a $36.6 million goal but only raised $10 million. They also originally planned for the event to be 4 days but scaled it back to 3, also due to "logistics" I'm sure. Don't worry, Barry will still be there to fill your minds with gobbledygook. "When you can't raise the cash 'cause your policy's trash....that's logistics"!
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