"We estimate that half a million Coloradans use every year, and we don't think those people should become criminals simply for choosing to use," Aldworth argues. "Coloradans have supported making marijuana legal for adults for years."
She notes making marijuana safe and legal could open up new revenue streams for the state.
"Colorado tourism continues to increase, and this might even draw more visitors here," Aldworth says.
The measure is leading with 51 percent of Coloradans supporting it, according to a recent Denver Post poll.
Oregon is the third state to push for legalization this election cycle, but efforts there do not look as promising.
Allen St. Pierre, the executive director of NORML, says it is the least likely to pass because it is very broad, idealistic and just a bit too "pro pot."
The Oregon law doesn't designate how much an individual can possess or grow, and polling shows Oregonians will likely say no to measure 80.
A Survey USA polls out last week found 36 percent were behind legalizing marijuana, while 43 percent were against it.
And the Oregon law has not attracted the funding the other two initiatives have.
"They jumped in to the game a little late," St. Pierre explains.
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Lauren Fox is a political reporter for U.S. News and World Report. She can be reached at firstname.lastname@example.org or you can follow her on Twitter @foxreports.