The democrat party isn't really "left wing"
Biden has made some good attempts at rebuilding government infrastructure and restoring environmental policy and gets an E for effort at student loan debt, but he's still pro cop, pro military, supports business over labor, and buys into the myth of American exceptionalism too much to be considered "leftist."
Even AOC seems like more smoke than fire lately.
When the D behind a politician's name is expanded is usually expanded as Democrat, not as Democratic.