Which logical fallacy is used in the text?
President Stewart is an effective communicator, because he has a natural talent for speaking with people.

 - hasty generalization: a very broad claim based on very little evidence
 - circular reasoning: an argument that supports a claim with the claim itself
The text argues that President Stewart is an effective communicator because he communicates well. However, the "evidence" is just a restatement of the claim itself. This illustrates a type of logical fallacy known as circular reasoning.