Code of Federal Regulations Title 5. Administrative Personnel § 5.734.206 Participation in elections

(a) Register and vote in any election;

(b) Act as recorder, watcher, challenger, or similar officer at polling places;

(c) Serve as an election judge or clerk, or in a similar position;  and

(d) Drive voters to polling places for a partisan political candidate, partisan political group, or political party.

Example:  An employee may drive voters to polling places in a privately owned vehicle, but not in a Government-owned or leased vehicle.