Of course the response from the law enforcement community, most conservative law makers, and people that don't remember the end of prohibition, is outrage. The usual fears of increased usage leading to laziness, more car accidents, health problems blah blah heard it before. People forget that alcohol underwent a similar change, at first being criminalized by the Progressive party (which pulled a T.I. and J.T. Dead and Gone) during the early 20th century, outlawed, and legalized absolutely to help stem budget shortfalls from the beginning of the Great Depression. An average of 3 nation wide polls (Rassmusen, CBS News, Zogby) was 40% support for legalization, the highest recorded average ever. 13 states have already passed significant decriminalization measures, and several more are going through the process of adding new measures lessening penalties.
If you need more info, don't talk to your local hippe.