44 Pa.C.S. § 7131 – Public office

(a) General rule.— Except as set forth in subsection (b), it shall be unlawful for a constable to hold or exercise the office of magisterial district judge or alderman.
(b) Exceptions.— Nothing in this section or in any other law or court rule shall be construed to prohibit a constable from:
1. (1) being an officer of a political body or political party as those terms are defined in the act of June 3, 1937 (P.L.1333, No.320), known as the Pennsylvania Election Code;
2. (2) holding the office of a national, State or county committee of a political party;
3. (3) running for and holding an elective office; or
4. (4) participating in election-day activities.