John Hickenlooper

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Colorado Gov. John Hickenlooper is pictured during an interview with the Associated Press at his office in the Capitol in Denver, Dec. 12, 2012.

** FILE ** Colorado Gov. John Hickenlooper is applauded by lawmakers as he signs the state's gun-control bill into law at the Capitol in Denver on Wednesday, March 20, 2013. (AP Photo/Ed Andrieski, Pool)

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Colorado Gov. John Hickenlooper is caught between two cultural currents: his state’s longtime Western tradition of gun ownership, and the recent push for public safety in the wake of two notorious mass shootings. (Associated Press)

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“Colorado is known for many things — marijuana should not be one of them.” - Colorado Gov. John Hickenlooper (Associated Press)

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President Barack Obama, center, jokes with Sen. Michael Bennet, Colorado Democrat, left, and Colorado Gov. John Hickenlooper after Obama's campaign stop on the campus of the University of Colorado in Boulder, on Sunday, Sept. 2, 2012. (AP Photo/David Zalubowski)