The ganja gala is set to go down this weekend in L.A. -- and according to the ad, marijuana patients are going to "celebrate Obama ending DEA raids" on weed stores.
A rep for the White House told TMZ there's a longstanding policy "disapproving of the use of the President's name and likeness for commercial purposes" -- but the rep wouldn't say if the Photoshoppin' potheads were going to face legal action over the ad.
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