Final answer:
The patient described in the question likely suffers from a dissociative disorder, most probably dissociative fugue, which involves a sudden change of location and possible assumption of a new identity.
Step-by-step explanation:
The scenario described in the question suggests that the patient is experiencing a type of dissociative disorder. Dissociative disorders are characterized by a disconnection and lack of continuity between thoughts, memories, surroundings, actions, and identity. The fact that the individual claimed to be a TV anchorman, which is inconsistent with his true identity as a dairy farmer, coupled with the lack of identification and having been reported missing, implies a dissociative episode where an individual may assume a new identity or forget their past.
Specifically, this could be an instance of dissociative fugue, a subtype of dissociative amnesia, where a person suddenly travels away from home, can't recall their past, and may take on a new identity. The red blazer and imitations he did are not typically diagnostic and therefore not reliable indicators compared to the overall behavior described.