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When the candidates are officially announced to the public. Joe Biden announced he was running for president.
https://ballotpedia.org/Timeline_of_announcements_in_the_presidential_election,_2020

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It takes place the year before the presidential election and the winner is the candidate with the most support in the polls and the most money raised at the end of the year. Joe Biden won the 2020 invisible primary with 19,076,052 popular votes.
https://en.wikipedia.org/wiki/2020_Democratic_Party_presidential_primaries
https://thehill.com/opinion/campaign/451852-the-invisible-primary-has-begun/

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Two methods that states use to select a potential presidential nominee. Caucuses are private meetings run by political parties held at the county, district, or precinct level and at the end, the number of voters in each group determines how many delegates each candidate has won. Primaries are run by state and local governments and voting happens through secret ballots where all voters can participate. Biden received 2727 pledged delegates.
https://th.usembassy.gov/primaries-caucuses-differences/
https://www.cnn.com/election/2020/primaries-and-caucuses
https://www.270towin.com/2020-election-calendar/

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In each state, political parties and independent candidates that qualify for ballot access nominate tickets of candidates for the office of elector for President and Vice President. Biden was officially nominated on the second night of the Democratic National Convention.
https://crsreports.congress.gov/product/pdf/IF/IF11641
https://www.usnews.com/news/elections/articles/2020-08-18/joe-biden-officially-selected-as-2020-democratic-presidential-nominee

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Refers to a presidential nominating convention in which candidates are nominated. The Democratic convention was held in Milwaukee, Wisconsin on August 17-20, 2020
https://www.270towin.com/2020-election-calendar/

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This is when the candidates annouce their stances on political topics to get voters. Biden began his campaigning on April 25, 2019 by releasing a video.
https://en.wikipedia.org/wiki/Joe_Biden_2020_presidential_campaign#:~:text=The%202020%20presidential%20campaign%20of,Donald%20Trump%20and%20vice%20president

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The annual day set by law for the general elections of federal public officials. This was on Nov 3 in 2020.
https://en.wikipedia.org/wiki/Election_Day_(United_States)

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Members of the Electoral College cast their ballots for president the winner of each state's popular vote earns that state's electoral votes. The candidate who received the majority of the 538 votes or 270 wins the presidency. Biden won 306 votes in 2020 which made him president.
https://www.reuters.com/article/usa-election-timeline-idINKBN27C1XC
https://www.cnn.com/election/2020/results/president