Tuesday 1 March 2016 (presumably): Massachusetts Primary. Hours 7:00a-8:00p EST (1200-0100 UTC). Some municipalities may open their polls as early as 5:45a EST. Delegate Pledging: Proportional Primary. Voter Eligibility: Modified Primary.

Primary
Source: Secretary of the Commonwealth of Massachusetts.
Status: Official. Retrieved: Thursday 26 May 2016.
Included in Nationwide vote.

Tuesday 1 March 2016 (presumably): 91 of 115 delegates to the Democratic National Convention are pledged to presidential contenders based on the results of the voting in today's Massachusetts Presidential Primary. A mandatory 15 percent threshold is required in order for a presidential contender to be allocated National Convention delegates at either the congressional district or statewide level. How the Democratic Proportional Delegate Allocation Math works.

• 59 district delegates are to be allocated proportionally to presidential contenders based on the primary results in each of the State's 9 congressional districts.
• 32 delegates are to be allocated to presidential contenders based on the primary vote statewide.
  • 20 at-large National Convention delegates
  • 12 Pledged PLEOs

Primary
Source: Secretary of the Commonwealth of Massachusetts.
Status: Official. Retrieved: Thursday 26 May 2016.

List of Delegates from the the Massachusetts Democratic Party.

Saturday 9 April 2016 (presumably): The Congressional District Caucuses meet to elect National Convention District delegates according to the results of the primary.

Saturday 7 May 2016 (presumably): State Committee and National Convention Delegate Meeting

The Pledged PLEO and At-large National Convention delegates are selected by the State Party Committee according to the results of the primary.

The remaining 24 National Convention delegates consist of

• 24 Unpledged PLEO delegates:
• 10 Democratic National Committee members.
• 11 Members of Congress (2 Senators and 9 Representatives).
• 0 Governors.
• 3 Distinguished Party Leaders (former DNC Chairman Steve Grossman, former DNC Chairman Debra DeLee, and former DNC Chairman Paul G. Kirk, Jr.).

These 24 delegates and will go to the Democratic National Convention officially "Unpledged".

Current law sets the Presidential Primary to the 1st Tuesday in March and the Partisan Primary to 7th Tuesday [20 September 2016] preceding the November General Election [The General Laws of Massachusetts, Title VIII, Chapter 53: Section 28.].

Billl H.574, sponsored by James J. Dwyer, was filed on 14 January 2013. The bill changes Chapter 53, Section 28 to read "State primaries shall be held on the second Tuesday in August... Presidential primaries shall be held on the first Tuesday in March..."

Billl H.575, sponsored by James J. Dwyer, was filed on 14 January 2013. The bill changes Chapter 53, Section 28 to read "State primaries shall be held on the first Tuesday after the first Monday in June... Presidential primaries shall be held on the first Tuesday after the first Monday in June..."

H.551, introduced by state Representative James J. Dwyer (Democratic) on 10 March 2015, would (1) move the Presidential primary from the 1st Tuesday in March to the 1st Tuesday after the 1st Monday in June and (2) move the partisan primary from the September (in 2012 and 2014 laws were passed to hold the primary on 6 September and 9 September respectively) to the 1st Tuesday after the 1st Monday in June.

H.609, introduced on 10 March 2015 by state Representative Ellen Story (Democratic), would establish ranked voting for military and overseas absentee Presidential primary ballots - "... permit the voter to rank the candidates in order of choice."