Wisconsin Republicans caused a stir by limiting the power of a newly elected Democratic governor.
If signed by the outgoing Republican governor Scott Walker, the bills will curb the authority of the incoming Democrat Tony Evers and his attorney general.
The demonstrators have been demonstrating for days in the capital of the state of Madison, accusing the Republicans of having tried to fix the system.
But state republicans say laws only try to balance power.
In the neighboring state of the Midwest of Michigan, another Republican-controlled legislature is considering the passage of similar laws to incorporate newly-elected democrats.
The controversy mirrors what happened in North Carolina in 2016 after a Republican governor in office was defeated by a Democrat.
In a nine-hour session, all night long that began Tuesday, Wisconsin Republicans in the state Senate pushed through a series of proposals that would limit the general roles of the governor and the attorney.
The party has lost both positions towards the Democrats in the mid-term elections of 6 November.
If Mr. Walker approves the bills – and indicated support for the measures – his successor will be forced to seek permission from the legislator before seeking changes to various programs.
In addition, invoices limit the governor's ability to address early voting laws and voter identification.
These are crucial provisions in a presidential presidential state that President Donald Trump has only just won in 2016.
And the attorney general would no longer be able to remove the state from federal lawsuits.
That power, along with others, would instead go to the state legislative branch, still dominated by the Republicans.
This would prevent Mr. Evers and general-elect Josh Kaul from making up for election promises such as the removal of the state from a lawsuit against the Affordable Care Act of the Obama era.
The state Senate approved 81 people for advice, authority and advice during the same night session.
Governor Walker also approved a judge and two district attorneys.
The demonstrators were freed from the Senate galleries shortly after the session began. They sang: "Shame!"
In a statement on Wednesday, Mr. Evers said that "power-hungry politicians" pushed the changes to "bypass the will of the people of Wisconsin who called for change."
But Republicans say the changes are disproportionate and ensure that the Wisconsin government is evenly balanced.
Republican Robin Vos, president of the Wisconsin State Assembly, said on Twitter that "Democrats have exaggerated and resort to hyperbole".
"The vote is to ensure the existence of equal branches of government in Wisconsin, especially during this period of divided government."
The Democrats replied that the other side did not object to this when a Republican governor was in power.
The Republicans controlled Wisconsin for eight years.
Mr. Evers won the government run against Mr. Walker by a margin of less than 30,000 votes.
If the invoices are challenged for lawsuits, the government may be faced with a stalemate next year.