“A troll,” according to one definition, “is a person who sows discord … by starting arguments or upsetting people … with the deliberate intent of provoking readers into an emotional response or of otherwise disrupting normal on-topic discussion.”
The goal of the troll is to provoke a reaction by any means necessary. Trolls thrive in communities that are open and democratic (they wouldn’t be invited into a discussion otherwise) and which operate in presumed good faith (there need to be some standards of decorum to offend). Presidential nomination contests are highly susceptible to trolling, therefore. Access is fairly open: There’s no longer much of a filter between the campaigns, the media and the public. And it’s comically easy to provoke a reaction. How many times between now and next November will we hear that a candidate’s statement is “offensive,” whether or not it really is?
Trolls operate on the principle that negative attention is better than none. In fact, the troll may feed off the negative attention, claiming it makes him a victim and proves that everyone is out to get him.