According to a Survey USA poll conducted August 9-11 California voters favor Prop. 19 by 50 to 40 percent. Things are looking very good for California advocates of legalizing pot.
It is hard to see how the dynamics of public perception on this issue change much before November. The issue has been out there for a long time and opponents are going to be hard-pressed to come up with compelling arguments as to why, with the state in a financial crisis, California shouldn't stop its expensive and counter-productive war on pot and tax it to help deal with the Golden State's budget crisis.
UPDATE It has been pointed out in the comments that Proposition 8 was failing in polls shortly before the November 2008 election. Indeed, I did some research and found that a Field Poll taken in September had it down 17 points. As we know, it eventually passed due to a well-organized campaign by the right-wing religious bigots. So the good news in the poll cited in my diary should not be taken for granted. If Californian activists want to legalize cannabis, they need to keep fighting for it.
It is interesting to note that Proposition 19 has more support among Californians than either Senator Barbara Boxer or Gubernatorial Candidate Jerry Brown who have both come out against it. They might want to re-think their positions. If either of their GOP opponents were smart and gutsy enough to get behind this popular measure it could change the dynamics of the race in a manner most unfavorable to our Democratic candidates. Fortunately for Brown and Boxer, I don't see either Whitman or Fiorino being that bold or forward-thinking.