Answer questions directly. Then elaborate with examples. Choose examples that highlight past successes and relate it to the projects or issues that interviewer is facing, but avoid excessively lengthy responses. Remember, interviews are time-limited, so use that time to focus the interviewer's attention on your strengths and successes. Public administration at all levels is a difficult, demanding job.
Successful performance requires dedication and high energy.
You should recognize the interview as your best opportunity to display the energy, initiative and commitment that you will bring to the position when hired. If you can psychologically commit yourself to the job, withdraw as a candidate. Don't forget to ask for the job. Don't beg, but do tell the prospective employers that you want to work for them. Dress appropriately and professionally.