5 C.F.R. § 734.412

An employee covered under this subpart may not:

(a) Be a candidate for partisan political office;

(b) Act as recorder, watcher, challenger, or similar officer at polling places in concert with a political party, partisan political group, or a candidate for partisan political office;

(c) Drive voters to polling places in concert with a political party, partisan political group, or a candidate for partisan political office.