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As I noted on Wednesday, Chief Financial Officer Nat Gandhi found that the District would bring in more money this year than originally anticipated. But Mayor Vince Gray still isn’t excited about the prospect of a $115 million shortfall, and thinks Gandhi lowballed the District. Yesterday, he fired off a letter asking the CFO to look under some more rocks. “It is difficult for me to believe that the revenue impact of these positive trends in fiscal year 2013 will be as insignificant as you currently project,” Gray wrote, noting the city’s falling unemployment, increasing population, and expanding economy.

Here’s the letter:

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