Any Democratic congressman who has ever voted against raising the minimum wage, reducing welfare programs, education, science or medical research, aka. actual progressive policies
A lot of times what will happen is they'll support these things under Republican administrations or when Republicans hold control of congress because they know there's no chance of actually getting them passed, so they can pay lip service to their constituents and say "See, look, I voted to raise the minimum wage! Aren't I progressive?!" while actually still maintaining the corporate policy their donors want. Same thing that just happened with Booker and his opposition to lowering pharmaceutical drug costs.
How many Democratic congressmen can you name that have been consistent throughout their career on progressive issues like the ones I mentioned earlier whether they're in control of the government or not? Not very many, which is consistent with the approval rating of congress