The yes on prop 37 effort was enjoying a 26-point lead in the poles until tens of millions of dollars were donated by the Big Businesses who want to see this proposal fail. 19 points of that advantage have recently been smashed by propaganda. Out to confuse and place doubt in voters, this effort is gaining momentum but the yes on 37 folks are not backing down. Here is an article from AlterNet that clarifies some of the confusion stirred up by the ads.
Big Business ad blitz might be working