Liberals and conservatives alike have made "weighted student funding" a core idea of their reform prescriptions. Both groups see such weighted funding as providing more dollars to the specific schools they tend to focus upon, and both see it as inspiring improved achievement through newfound political pressures. Unfortunately, both groups are very likely wrong.
Schools will not improve until there are greater incentives for improving student achievement. Redistributing funds across schools or increasing the funding to schools by themselves will not magically put us on this path.