That runs counter to elected officials (and government employees) being called for jury duty and speaking highly of it as their civic duty. What you are saying is that being elected (or a government employee) makes a person ineligible to serve as a juror, as a matter of law. No further excuse need be given, to get out of jury duty, "I am an elected official" or "I am a government employee."
Can’t speak to local practices, but:
http://www.uscourts.gov/services-forms/jury-service/juror-qualifications
... There are three groups that are exempt from federal jury service:
members of the armed forces on active duty;
members of professional fire and police departments; and
“public officers” of federal, state or local governments, who are actively engaged full-time in the performance of public duties.
Persons employed on a full-time basis in any of these categories are barred from serving on federal juries, even if they desire to do so...