Establishes ranked-choice voting procedure for presidential primaries and general elections for electors for United States President and Vice-President.

S 1631 would require New Jersey to use ranked-choice voting for presidential primaries and general elections for electors of U.S. President and Vice-President. Under this system, voters would rank candidates in order of preference on ballots, and votes would be redistributed in rounds until one candidate reaches 50% plus one of the valid votes. The bill mandates ballot design allowing voters to rank at least six candidates, includes rules for handling exhausted ballots, and directs the Secretary of State to create implementation guidelines. The law would take effect immediately but would not be implemented until voting machines are certified for ranked-choice voting, 12 months after that certification. This change applies only to presidential elections, not to state or local offices.