In November 1998, Michigan voters rejected Proposal B, a citizen initiative that would have legalized physician-assisted suicide (PAS). Although polls had long indicated overwhelming support for PAS, support for Proposal B declined before the election. We analyzed exit-poll data to characterize opponents, supporters, and cross-over voters. We then compared our results with those from earlier research that examined attitudinal and socio-demographic influences. We found that many presumptive PAS supporters did not vote for Proposal B. These data may call into question prospects for similar initiatives.