Dodge Magnum Brake Rotor

You need to back off the hidden emergency brake shoes that contact the interior part of the rotor. Remove the rubber plug on the inside and rear part of the hub and use a screwdriver to back off the star wheel adjuster. Unless you do this, you'll never get the rotors off.
Hint: the secondary drum type emergency/parking brake shoes may need replacement

Some vehicles have a small screw that holds the rotor to the wheel hub, not certain if the Magnum has one or not. If there are no srews your most likely problem is a corrosion ring that has built up between the rotor and the wheel hub axle. Try applying some heat to the brake rotor at the seam where it meets the wheel hub's axle. It needs to get hot, but not red hot. The heat may cause to two metal componets to expand at a slightly different rate, and then cool back slowly. Use your rubber mallet and see if the parts will separate. I have run into this situation several times and I have yet to find a rotor that cannot be removed.