Final answer:
The logical fallacy used in the sentence is red herring.
Step-by-step explanation:
The logical fallacy used in the sentence is red herring. A red herring fallacy occurs when someone introduces an unrelated topic or argument to divert attention from the initial topic or argument. In this case, the candidate is asked about his plan to reduce taxes, but instead of directly answering the question, he brings up the importance of improving the unemployment rate. This diverts attention away from discussing the specific plan to reduce taxes.