No person shall hold more than one elected office at the same time. This section shall apply to every office elected by the qualified voters of the Commonwealth or any political subdivision or part thereof. The qualification for and taking of the oath for a second elected office by any person shall operate to vacate any other elected office held by him. This section shall not be construed to repeal or affect provisions of law authorizing the sharing of elected offices by two or more jurisdictions. Any person serving in more than one elected office on July 1, 1993, shall be entitled to complete the terms for which he was elected. A person may serve as a Presidential elector while holding any other elective office of the Commonwealth or any political subdivision or part thereof, and this section shall not be construed to prohibit such dual officeholding.