[video=youtube;xs16ozOu2ro]http://youtu.be/xs16ozOu2ro[/video]
This is one of the easiest methods for rooting any Motorola device that is running ICS. You can thank DjrBliss for this method. Chances are if you own a Motorola device with Root he is the guy that found the exploit.
Grab the exploit file here: DroidForums Droid4 Root
Grab the exploit file here: DroidForums Droid4 Root