Does the constituency here mean supporters who had voted for him in his campain for the position of Surgeon General?
Yes. I'm not exactly sure how a surgeon general is voted in, but this suggests that his latest statements will upset those who originally supported his bid for the role.
Richard Harris reports the statement are something of departure for the surgeon general.
This suggests that he has changed his views on the issue, and that his current attitude is contrary to what it was in the past.
I am not a teacher.
Student or Learner