I believe that the state of Maine, and particularly the city of Portland, Maine are set to become huge players in the USA cannabis industry soon.
Portland is the biggest city in Maine and tends to be very liberal. Portland will be voting on a bill to regulate cannabis like alcohol this November. They are the first city in the US to ever try to legalize cannabis on a city-wide level and there is a surprising amount of support.
Maine is a decriminalized state and already has legalized medical marijuana. The state of Maine looks to be one of the most likely to pass laws to regulate marijuana like alcohol next. They almost voted on it statewide this November, but the bill didn't quite make it, though it received a lot of votes in support.
MPP (the Marijuana Policy Project; backed by businessmen interested in getting marijuana legalized nation-wide, and the people who did a lot of the legwork in changing attitudes in Colorado and Washington) has recently been dumping a lot of their money and effort into Maine, since nearly half the population wants to legalize marijuana already, and there have already been (and continue to be) attempts to increase access to cannabis for adults there.
A bit more background about why Maine is a good candidate for legalization:
Maine has an aging population as children have been leaving the state for many years, and a lot of the elderly are becoming more open to the idea of medical cannabis as they fight some of the conditions where cannabis can be most helpful. There is less "think about the children" type thinking as there are relatively few children in Maine compared to the elderly.
Maine's main staple for money, the tourism industry, has been suffering in recent years. A lot of struggling business people in Maine seem to be intrigued by the idea of increasing tourism via legalization.
Maine citizens tends to place a lot of value on personal privacy. Outside the few major cities, most citizens live in relatively small, rural or farming towns. There's only about 1.3 million people in the entire state of Maine (to put that into perspective, they just have one area code for all Maine phone numbers). People living in these small towns outside the cities tend to have a desire to want the government to stay out of their business.
The people tend to be very liberal in the cities, including and especially the tourism-heavy beach cities.
On top of those factors, there's a huge prescription drug addiction problem in parts of Maine, and there is some hope that increased access to cannabis and medical marijuana might help reduce this tendency.
Plus, since the population is so small, there's the fact that you only have to convince less than a million people to get the entire state to legalize cannabis, so money towards changing attitudes goes a lot farther in this state than in bigger ones with more people to change the attitudes of.
Learn how to get involved here: http://www.mpp.org/states/maine/