In terms of politics, both parties are controlled at the top by the same people.
Nancy Pelosi and Mitch McConnell are both on Team Establishment. It is why there are no policy shifts regardless of which party controls Congress or the White House
It is like a con game in which the operator and the shill take turns at each position.
This a quote from Carroll Quigley's book Tragedy and Hope. Quigley was an Establishment academic at Georgetown University, and was instrumental in Bill Clinton's ascension into the Establishment.
"The argument that the two parties should represent opposed ideals and policies... is a foolish idea. Instead, the two parties should be almost identical, so that the American people can throw the rascals out at any election without leading to any profound or extensive shifts in policy."
And that is exactly where we are today.
So, that said, there is no Democrat that is concerned with liberty, i.e. the constraint of government. They talk about "rights", but they only advance narratives that are destructive to the family and social fabric - which has long been an Establishment objective.
Abolition of the family is a critical battlefront in terms of overthrowing a nation as solidly founded as the United States (read Marx).
Republicans on the other hand are quite similar, but carry water for the Establishment on different fronts. Namely war, and globalist policies which contribute greatly to the deindustrialization of the United States.
Sen. Ben Sass's (R-Neb) actions that shut down a distribution center in his state, and cost thousands of jobs, was him doing the bidding of the Establishment to the detriment of his own constituents.
All of that said, the only people actively fighting the Establishment and working to preserve the Constitution and save America, are a small minority of Republicans and some Libertarians.
I am a liberatarian (small l). No Democrat is aligned with us - the closest one is probably Tulsi Gabbard, whom I like.