While there are no detailed documents on their websites, it is now obvious that there is a very public fight for CBS to takeover Viacom, including leaks this week to Variety and Reuters, which are pretty much in full agreement that a low ball bid has already been made and already been rejected, signaling that talks are now on in earnest. The low bid shows the ruthless streak in Leslie Moonves, who has clearly realized that the lower the value of Viacom in such a deal, the higher value his existing CBS Class B non-voting stock and options amount to in the combined entity. If he has to take over Viacom, he wants to make sure he gets fully compensated…