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

 - false causation: the assumption that because two things happened together, one caused the other
 - circular reasoning: an argument that supports a claim with the claim itself
The text argues that President Rudd 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.