On 31 December 2018, Democratic Senator Elizabeth Warren (Massachusetts) announced that she had formed an Exploratory Committee that allows her to start raising money for a potential 2020 run for the Presidency.
Will she be the 2020 Presidential Nominee of the Democratic Party?
This question resolves positively if the Democratic Party officially recognizes (via press release, or any public statement made by official spokespeople or leadership figures of the Democratic Party) that Elizabeth Warren is the Nominee of their party for the office of President of the United States in the 2020 election cycle.
Warren need not be the Democratic Party Candidate on the date of the Presidential Election for this question to resolve positively; she merely needs to become the official Democratic Party Nominee at some point. A nomination for the office of Vice President shall not suffice for a positive resolution.