The Supreme Judicial Court has ruled in favor of medical marijuana opponents who say the probable November ballot question on the issue is misleading. Attorney General Martha Coakley’s office must now rewrite the ballot question in light of Thursday’s ruling. The Massachusetts Prevention Alliance filed a petition against the question in May that was dismissed by Coakley’s office for not offering a valid way for the court to grant its request, such as by proposing another way to write the question. Heidi Heilman, the group’s president, said she would like the question to outline that under the proposal 35 marijuana dispensaries could be created in the first year, patients would be able to possess an undefined 60-day supply, and some could grow marijuana at home.