You're cherry-picking data to support a predetermined conclusion, not drawing a conclusion from the data. If it were a left-wing thing, where is Massachusetts in your list? Why no such movement in New York, or Vermont, or the overwhelmingly left-wing Washington DC? Germany and France are more left-wing than the Netherlands and Canada and the UK, yet neither of them are legalizing.
"Left wing = pro legalization" doesn't add up. And for good reason! Left wing means totalitarian more often than not, and the WoD is an excellent tool for totalitarians.