This is something of a reversal from just a month ago, when the most recent polling had shown voters wary of legalization measures in Massachusetts and Arizona. But the margins of support aren't huge in any state, meaning that the contests could still swing either way.
"These poll numbers are not surprising," said Paul Armentano, deputy director of the National Organization for the Reform of Marijuana Laws, in an email. "Most Americans agree that the responsible adult use of cannabis ought not to be criminalized. The battle now is finding consensus regarding the details of how best to regulate this market."
Marijuana opponents, for their part, are optimistic about their chances. "If anything, the polls should give the opposition some comfort," said Kevin Sabet of the anti-legalization group Smart Approaches to Marijuana. "If you are not at 60 percent at this stage in the game, it usually spells trouble for ballot initiatives."