Will more than a half-dozen states have legalization initiatives on the ballot in 2016?

The question in the title of this post is prompted by this report that "two groups hoping to legalize marijuana in Massachusetts in 2016 will formally file the language of their proposed ballot initiatives with state Attorney General Maura Healey today." Adding the Bay State to those with active legalization initiative efforts afoot leads me, aided by this additional report, to arrive at this list of states that may well have its voters considering full marijuana legalization at the same time they are picking our next president:

1. Arizona
2. California
3. Maine
4. Massachusetts
5. Michigan
6. Missouri
7. Nevada
8. Ohio

For a variety of reasons, possible adoption of full legalization California would be the biggest marijuana reform story to watch during the 2016 cycle.  But the potential impact of initiative reform efforts in traditional swing states like Michigan, Missouri, Nevada and Ohio would also be worth watching closely in conjunction with broader election dynamics.