The ISM is not charged. Most of it is ionized, however. The jet itself has a magnetic field that is largely parallel to the jet, though it gets tangled up in

The ISM is not charged. Most of it is ionized, however. The jet itself has a magnetic field that is largely parallel to the jet, though it gets tangled up in the "bubble" that the jet blows in the ISM. The bubbles can be quite large (comparable to the size of the galaxy itself), but are usually outside the galaxy. I don't believe that the jet much changes the magnetic field of the ISM anywhere away from the jet.