WATCH: Protester storms the stage and steals the mic from Kamala Harris at California Democratic Party convention

Democratic Party 2020 hopefuls -- except for Joe Biden -- descended upon San Francisco for the 2019 California Democratic Party convention.

Delegates and activists were able to see speeches by over a dozen 2020 candidates at the events surrounding the convention.

At one such event, MoveOn's "Big Ideas" conference, a protester stormed the stage and stole the microphone from Sen. Kamala Harris (D-CA).

Watch: