Rule 1: The incumbent always receives a majority of the popular vote.
Rule 2: If the incumbent receives less than a majority of the popular vote, see Rule No. 1.
Rule 3: If you had to consult Rule #2 to reach Rule #1, make your lie believable. Claim 100% of the vote, and even your staunchest supporters will not believe you. A 58%-42% landslide is just about as good as it gets.