The American Presidency Project

• 2016-2020: Calculated by the APP by using Real Clear Politics and 538.com (Nate Silver) poll averages. The average published on the Monday of the convention week and average published the Monday following the convention week were used for comparison, and are rounded to whole integers. These averages include polling that ended the Sunday before the convention began and ending on the Sunday following the convention. Beginning in 2016, Gallup no longer conducts voter preference surveys. • 2008-2012: Calculated by the APP from Gallup poll ending on the Sunday before the convention and poll ending on the Sunday after the convention. • 1964-2004 data calculated by Gallup

Data cited at: Gerhard Peters. "Presidential News Conferences." The American Presidency Project. Ed. John T. Woolley and Gerhard Peters. Santa Barbara, CA: University of California. https://www.presidency.ucsb.edu/node/323900 Note:-1.All latest and historic dates for Presidential election years where President-elect changed has been taken as follows - 1923-24 taken as 1923, 2020-21 taken as 2020 

Number of Ballots Required to Nominate Presidential and Vice Presidential Candidates at National Nominating Conventions

Number of Times Cities Have Hosted Democratic and Republican National Conventions : 1832 - 2020

Citation: Gerhard Peters. "Political Party Platforms of Parties Receiving Electoral Votes." The American Presidency Project. Ed. John T. Woolley and Gerhard Peters. Santa Barbara, CA: University of California. 1999-2016. Available from the World Wide Web: