Participation in Pennsylvania's delegate selection process is open to all voters who are enrolled as members of the Democratic Party. Pennsylvania requires voters to be enrolled for no less than 30 days prior to the Primary.

This Presidential Primary coincides with a state/local primary. These coinciding primaries tend to have an impact upon voter turnout.

Tuesday 26 April 2016: Pennsylvania Primary. Hours 7:00a-8:00p EDT (1100-0000 UTC). Delegate Pledging: Proportional Primary. Voter Eligibility: Closed Primary.

Primary
Source: Pennsylvania Secretary of State.
Status: Official. Retrieved: Monday 30 May 2016.
Included in Nationwide vote.

Tuesday 26 April 2016: 189 of 208 delegates to the Democratic National Convention are pledged to presidential contenders based on the results of the voting in today's Pennsylvania 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.

• 127 district delegates are to be pledged proportionally to presidential contenders based on the primary results in each of the State's 18 congressional districts.
• In addition, 62 delegates are to be pledged to presidential contenders based on the primary vote statewide.
  • 42 at-large National Convention delegates
  • 20 Pledged PLEOs

District Level delegates appear on the primary ballot and selections are made from the highest vote getters. In the event a presidential candidate qualifies to receive District delegates but failed to slate a sufficient number on the primary ballot, the necessary delegates will be elected at the State Convention.

Primary
Source: Email from the Pennsylvania Department of State.
Status: Official. Retrieved: Friday 10 June 2016.

Saturday 11 June 2016 (presumably): State Convention.

National Convention Pledged PLEO and At-Large National Convention Delegates are elected by the State Committee according to the results of the Primary.

The remaining 19 National Convention delegates consist of

• 19 Unpledged PLEO delegates:
• 12 Democratic National Committee members.
• 5 Members of Congress (1 Senator and 4 Representatives).
• 1 Governor.
• 1 Distinguished Party Leader (Note: former Governor Edward Gene "Ed" Rendell, Chairman of the Democratic National Committee from 1999 to 2001, is a Distinguished Party leader).

These 19 delegates and will go to the Democratic National Convention officially "Unpledged".

On 18 May 2015, state Representative Keith Greiner (Republican) published a memoranda indicating his intentions to introduce legislation to move the Presidential primary from the 4th Tuesday in April to the 3rd Tuesday in March.

HB 1318, introduced by state Representative Keith Greiner (Republican) on 10 June 2015, would move the presidential and partisan primaries from the 4th Tuesday in April to the 3rd Tuesday in March.