Final answer:
The candidate is portraying the Underachiever effect.
Step-by-step explanation:
The interviewing bias that the candidate is portraying is the Underachiever effect.
The candidate is downplaying their own skills and experience in order to align with the perceived expectations of the interviewer. By stating that they have always admired and wanted to work at the organization, the candidate is indicating that they are willing to take on a lower-level job despite their qualifications.