Here's why:
* Predicate Nominative: A predicate nominative is a noun or pronoun that follows a linking verb (like "was" in this case) and renames or identifies the subject of the sentence.
* Subject: The subject of the sentence is "The best person for the job."
* Linking Verb: The linking verb is "was."
* Predicate Nominative: "Mr. Dobbs" renames the subject, telling us who the best person for the job is.
Therefore, "Mr. Dobbs" is the predicate nominative.