On September 16, 2019, the Working Families Party endorsed Elizabeth Warren in the 2020 Democratic Party presidential primaries. In the 2016 primaries the party endorsed Bernie Sanders, one of Warren's opponents in the 2020 primary. Some backlash ensued after that decision was made due to the refusal of the WFP to release the vote; they had previously released the vote in 2016. "Jacobin" speculated that Sanders had likely won the party's membership vote, which mathematically implied that Warren received 82% to 100% of the leadership vote and only received between 22% and 40% of member support.