Trying this again from a different angle... Let's say we have a 120 Volt AC source. We'll call it a generator. This generator is not touching the earth. Let's just pretend that it's suspended in mid air with nothing at all connecting it to the ground (the earth). On this generator, there are two poles. If you put a volt meter across the two poles of the generator, your meter reads 120 Volts. You attach a wire to one of these poles, leaving the other one alone with nothing attached to it. You stick the other end of that wire into the earth. Does current flow? Why or why not?