Sweeping changes are incredibly difficult because the US Constitution intentionally made change slow. It was a purposeful attempt by the founders to prevent rapid policy changes and have some degree of stability.

When passing laws, 2/3 of EACH house of Congress is required to overcome a veto. This is why passing laws is difficult when one party does not own both houses with the presidency or a super majority in both houses without. This also says nothing about the judicial and their ability to check either of the other branches, in terms of what is "constitutional" per their interpretation.

Amendments to the US Constitution are even harder. 2/3 of each house of Congress or 2/3 of state legislatures must agree to a proposal and then 3/4 of the states must agree to the change for it to pass and the Constitution be amended.

What happened last night is one step on the road to permanent change, since historically red states have shifted (for now), and those states are required for long term policy to be put into place. It's an important step, but tempered expectations are crucial. There is still a lot of good/harm reduction that can be done as a result.

Correct. Best case scenario, we can be obstructionists to anything Mango Mussolini wants to do. Congress could pass really great stuff and let Fuckface go on record as vetoing it. Though he'd just blame it on Biden. I HIGHLY doubt enough Republicans would defect to override one of his vetoes. It requires 2/3 of both houses. The Democrats have a simple majority but do not have a veto-proof majority.