Another measure of mass shootings over time

One measure of multiple victim public shootings is available here.  Looking at this, my initial reaction is that it doesn't differentiate between gang fights and the type of attacks that have garnered so much attention at Newtown, Columbine, and other places.  This "counted a mass shooting as any murder where four or more people were killed at once."

Fox News has a story available here.
Another Fox News piece on Ron Paul's objection to the NRA proposal on putting police at schools.  I have to agree that I don't see the point of federalizing this.  State should have the right incentive to fix this problem.