'86 may be debatable, but I mostly blame him for starting California on its nasty downward trajectory. It's because of him that gun control is considered a bipartisan issue in California, and why it is so hard to make any headway there.
Sure, there would have probably been Peratas and Feinsteins without him, but because of him, those people are a lot more able to get their way on gun control.
And we all know that a lot of people look to California as a bellwhether state for the nation. I would argue that he should be considered responsible for a lot of our worst national laws.