"...To the party’s leadership, Tuesday was a wake-up call; to the the party’s left flank, it was validation of the tactics and messaging they’ve been pushing for months. Start with Brand New Congress. Ocasio-Cortez is the first candidate backed by the organization to unseat an incumbent, which, after all, is the group’s stated aim. The organization, which has backed 26 House and Senate candidates in 2018, was an important incubator during the early phase of her campaign. She attended trainings with the group... and...was in constant contact with other candidates... sharing talking points about issues like Black Lives Matter or pension reform and exchanging best practices for door-knocking."