At least 360 Democrat delegates, mostly Bernie Sanders supporters, have signed a pledge to vote against a Democrat national platform that does not include medicare for all.
According to Politicos delegate tracker, Biden has 2,632 delegates and Sanders currently has 1,076.
The Dems are holding a virtual DNC in Milwaukee in just three weeks and it looks there may be a repeat of the 2016 convention.
In 2016, Bernie supporters booed Hillary Clinton at the convention after WikiLeaks released DNC emails proving the primary was rigged in Hillarys favor.