Groups advocating for or against three statewide ballot issues spent a total of $9.3 million this year.
That's according to a review by the state Office of Campaign and Political Finance.
The only question that was rejected by Massachusetts voters attracted the most spending. The Committee Against Physician Assisted Suicide spent $4 million of a total of $5.8 million spent on Question 2, which would have allowed patients to self-administer life-ending drugs prescribed by physicians.
Backers of Question 3, which passed, spent more than $1.1 million in support of the medical use of marijuana for certain conditions. Most of the money came from a single donor, retired Ohio insurance executive Peter Lewis.
The Massachusetts Right to Repair Committee spent nearly $2 million in support of Question 1, which will require automakers to share repair information with independent mechanics.
This program aired on November 30, 2012. The audio for this program is not available.