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GOP presidential hopeful Gary Johnson used marijuana to treat pain after breaking his back in a paragliding accident. Scott Morgan spies a political advantage:

Johnson's medical use creates a unique opportunity to bring personal experience into the discussion and powerfully expose the cruelty and ignorance of any opponent who dares to defend arresting sick people. This could play out any number of ways, but if I were Mitt Romney or Tim Pawlenty, I'd already be worrying about how to handle the situation. When it comes to medical marijuana, Gary Johnson will enter the debate with the American people on his side, and he has everything to gain by going on the offensive early and often.

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