The question of the state proposal was: "A proposal to authorize automatic and Election Day voter registration, no-reason absentee voting, and straight ticket voting; and add current legal requirements for military and overseas voting and postelection audits to the Michigan Constitution."
Source for Popular Vote data: Michigan Secretary of State. 2018 Michigan Election Results, Michigan Secretary of State (https://mielections.us/election/results/2018GEN_CENR.html#) (accessed 17 Nov 2018)