Nobody seems to have moved to the left though. The only significant thing that passed was an infrastructure bill, and none of the Democrats in congress seemed to have made any radical opinion shifts.
The summer of 2020 included a number of radical opinion shifts among politicians. Or maybe, since we can't know a person's mind and what opinions they'd previously quietly believed, more like radical shifts in publicly stated position.
I think this was a case of playing vote chicken. There were a tiny number of democrats who were never going to vote for those bills. There are a larger group that didn't want to vote for those bills but didn't want to go against party lines. So they voted for bills knowing that they wouldn't pass. They risked nothing and still got the outcome they desired.
> The only significant thing that passed was an infrastructure bill