other than Boxer, who is still pretty centrist, none of those people are "liberal" as it's understood to be;
as mayor of SF, Diane Feinstein defended flying the Confederate Flag over San Francisco. yes San Francisco, CA, a place as far removed from the South as you can get. she's done a lot of equally bad things since then.
as CA AG Harris took money from Mnuchin to drop her investigation and prosecution of his mortgage fraud business.
Loretta is... eh... we've discussed her before.
I saw a pretty good distinction made between "Liberals" and "liberals" and that was that the real role Pelosi, Biden, Schumer, Clinton, Feinstein, etc. play is to defend Republicans from attacks on the left. aside from the handful of "wedge"
issues (guns, abortion, gay marriage) they favor the same economic policies, tax policies, "defense" spending, etc., and generally vote that way. they all take money from the same sort of corporations and super PACs that Mitch McConnell and Paul Ryan do, and like the majority of the GOP, they are owned by them and accountable only to them, not the people.
the "partisan" attacks the media complains about are really more like pro wrestling plotlines than actual disagreement between the parties. the outcome is decided behind the scenes in smoke filled rooms, but the speeches and votes make it appear to be legit.
There are a handful of actual liberals in Congress. very few. and perhaps even fewer actual conservatives on the GOP side (like Justin Amash in Michigan).