The Democratic Party has been doomed since the days of George McGovern when it started to embrace the radical left. Now under a Democratic Socialist moniker they have become full communist. While there will be some people who will support the new radical socialist agenda, the taste of socialist authoritarian rule under Biden has caused many of the Democrats traditional base to leave the party. The new Democrat base of liberal college educated white women and a radical fringe of LBTQ etc, Antifa, antisemetic extremists, environmental whackos and hard core Marxists is not a winning g ticket.
Even McGoverm os a moderate compared to these marxists.