Arizona Presidential Preference Election results will be posted as they become available on March 17, 2020. Arizona Democrats will vote for their preferred 2020 Presidential candidate in this primary. The Arizona Democratic Party primary includes Joe Biden, Tulsi Gabbard, Bernie Sanders, and Elizabeth Warren facing off for delegates. The winner could challenge President Donald Trump in November’s general election. Arizona’s Republicans are not having a primary in a show of support for Trump. 12 News is your Decision 2020 headquarters as the state becomes an increasingly purple battleground for candidates.