If you have done your research you already realize a couple important things:
The children who are placed in preschool programs will be exposed to traditional school work like worksheets, reading lessons and tests. All of this intense instructional time will displace time spent in free imaginative play which studies have shown is necessary for good cognitive development. This type of early classroom experience raises children's stress levels which has resulted in increased misbehavior and school assigned consequences. Connecticut schools suspended or expelled 901 kindergartners for aggressive behavior in 2002, twice as many as in 2000. One New Haven school official attributed the spike in violence among kindergarten children to the increasing emphasis on standardized testing and the elimination of time for recess, gym and other chances to play.
Common Core, data gathering and pre-school are all intertwined. Before your district asks you to vote for a tax increase to provide universal pre-school, demand that they show you the studies that prove it has long lasting gains. Better yet, ask them if they have done a liability study to ascertain the risk the district will face if they institute a preschool program that is later shown to adversely affect student health and development.
Missouri Coalition Against Common Core 2013