I support taxing the hell out of me and everybody else to make this happen. I don't claim deep knowledge about the research, other than that "pre-k is good and cost effective," but intuitively the benefits are pretty obvious. Whether you support the view of poor parents as being irresponsible unemployed drug addicts, or the view of poor parents as having insufficient time to nurture their children due to their attempts to make enough money by working 3 jobs, in both cases the issue is that poor parents are failing to provide time, attention, and education for their kids.
It's a low cost way to dramatically improve human welfare of the parents and the kids. Do it.