The rush to sling mud is gaining momentum, and "Farenheit 9/11" marks the polarization of yet another form of media. One medium after another has found it profitable to turn from information to entertainment, from nuance to table-thumping. Talk radio pioneered this strategy, then cable television. Political books have lately become as subtle as professional wrestling, and the Internet is adding to the polarization. Now, with the economic success of "Farenheit 9/11," look for more documentaries that shriek rather than explain. It's hard to blame this on Michael Moore. The public, through its hearty response to these variations on political entertainment, is largely responsible for creating an environment in which political documentaries become Event Movies. In essence, you are what you eat popcorn while watching. Where are the films praising the virtues and skills of the presumptive Democratic candidate? Calling Bush a Liar | 
