That's the case with pretty much every political race these days. IIRC the Senate race in PA last year was the highest-spending race in the country, and hundreds of millions came from outside the state. The best local Philly example is Larry Krasner getting $1.5M from George Soros when he first ran for DA. But I do agree with you that if there's to be a limit on campaign spending, it should be that non-residents spending money on local races gets severely limited (i.e. people from Florida don't spend money on PA races, and vice versa)