We should know who the Republican presidential nominee is by March 15 - The Washington Post
Rhode Island Secretary of State Nellie M. Gorbea on Twitter: "This infographic outlines the vote-by-mail process for the June 2 presidential primary! For important dates and frequently asked questions about the primary,
United States presidential primary - Wikipedia
Frontloading HQ: The 2012 Presidential Primary Calendar (Republican and Democratic)
2016 Primary Season Is upon Us: Deadline Reminders for Coordinated and Electioneering Communications during Presidential Primaries: Wiley
One-year countdown: A guide to the 2020 U.S. elections - CGTN
Presidential Primary changed to June 2, 2020 - State of Delaware News
As Washington's presidential primary nears, voters have more questions. We answer them. | The Seattle Times
Presidential Primaries: CQR
Will States Fix 2012 Primary Process? | The Pew Charitable Trusts
2012 election dates - Ballotpedia
Voter Registration Deadline for the 2020 Presidential Primary is May 12 – County of Union
Farmington, MI - March 10, 2020 Presidential Primary Election
Most U.S. voters say postponing primaries for COVID-19 was necessary | Pew Research Center
It's Early But the 2016 Presidential Primary Calendar is Taking Shape – Sabato's Crystal Ball
With DNC meeting to propose 2024 presidential primary calendar, all eyes on Nevada – The Nevada Independent
Frontloading HQ: The 2020 Presidential Primary Calendar