s the 2000 presidential campaign began, a young computer programmer from Massachusetts named Zack Exley enjoyed 15 minutes of fame when he created a website called GWBush.com. The site, which Exley billed as a "parody," featured a doctored photo of George W. Bush with what appeared to be cocaine on his upper lip and nose. It sold bumper stickers with sayings like "GWBush, Not a Crackhead Anymore!" and "GWBush, Born with a Silver Spoon Up His Nose." And it featured a cartoon of Bush dancing with a bottle in his hand as kegs of beer bounced around the screen and...