I'm extremely for the legalization of marijuana. It's incredibly stupid as to why it's illegal. Prop 19 failed for a few reasons:
1 - The younger voters are were a lot of the weight behind the prop was, but because it's an in-between year a lot of the younger voters usually don't turn out.
2 - A lot of people who smoke weed voted against prop 19 to protect their profits(both commercial and black-market growers/dealers).
3 - This year was obviously heavily conservative.
I'm hoping that with how close the vote was (difference of ~300,000 votes) that in 2012 it will be passed. There is absolutely no reason why it should be illegal while other substances like cigarettes and alcohol are legal and regulated.