It turns out that the newest members of the DNC Party were not nominated, in the traditional sense, but were chosen by a political organization known as Justice Democrats.
The Political Action Committee (PAC) was formed immediately following the 2016 election that saw the Republicans take back the White House under Donald Trump. The group was founded on January 23, 2017, by Kyle Kulinski of Secular Talk, Cenk Uygur of The Young Turks, and former leadership from the 2016 Bernie Sanders presidential campaign.
The Justice Democrats has stated a goal of reforming the Democratic Party by running "a unified campaign to replace every corporate-backed member of Congress" and rebuild the Democratic Party from "scratch".
In the 2018 elections, 26 of the 79 candidates endorsed by Justice Democrats won their respective primary elections. Seven of these candidates won in the general election: Raúl Grijalva, Ro Khanna, Ayanna Pressley, Rashida Tlaib, Ilhan Omar, Alexandria Ocasio-Cortez, and Pramila Jayapal.
Alexandria Ocasio-Cortez has had more than her share of media time and is attempting to move the DNC to the far left of the political spectrum. Any candidate running with Justice Democrats must pledge to refuse any donations from billionaires or corporations. She has threatened to create a list of any DNC member who accepts political contributions from corporations, or whose values undermine the objectives of this new movement.
Some argue that she is the best hope for Donald Trump's re-election in 2020.