I'd like to call attention to the opening statement:
Our public schools are the last real space where people from different classes and different walks of life come together to learn, to share ideas, and to be afforded a fair opportunity to reach for the American dream.
This is not really true in the US. While we tout public schools, unless there is an open enrollment policy for the area, we really have private schools that are based upon where people have chosen -- or can afford -- to live. Good schools attract people who are interested in excellent educations. The education supporters include parents who are involved and likely have good educations. They are likely making above the median salaries and are willing to pay more for housing and local property taxes than others who cannot afford the higher costs of housing around good schools.
We really have private schools because of the entrance barriers based on the students' addresses.
Keep the parents involved, invest in the schools, challenge the students to perform, make sure the students are fed and come to school ready to learn: all are good things that help ensure the neighborhood school success.