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

 - circular reasoning: an argument that supports a claim with the claim itself
 - ad hominem: a personal attack against one's opponent
The text argues that President Zimmerman 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.