"Ranked choice absentee ballots (also known as “instant runoff absentee ballots”) provide a legal and practical solution to the ballot transit time issue. Instead of requiring voters to request and return separate ballots for a primary and general election, or each round in a runoff system, voters receive two ballots: a standard absentee ballot for the first election and a ranked choice absentee ballot for the second election. The ranked ballot contains all the candidates from the first election, and voters rank them in order of preference, from first to last. Both ballots are returned before the first election, and the standard ballot is counted as usual. In the event of a runoff election or a general election, the ranked ballot is counted towards the highest ranked candidate who advances to the second round."
Ranked Choice Absentee Ballots: Preventing the Disenfranchisement of Military and Overseas Voters
FairVote.org:
