29 CFR § 452.117 - Majority of votes not required for election.
A labor organization may by its constitution and bylaws provide for the election of the candidate who receives the greatest number of votes, although he does not have a majority of all the votes cast. Alternatively, it may provide that where no candidate receives a majority of all the votes cast, a run-off election be held between the two candidates having the highest vote. Similarly, a labor organization conducting an election to choose five members of an executive board may designate as elected from among all the nominees the five candidates who receive the highest vote.
The following state regulations pages link to this page.