Missouri Senate Democrats filibustered a Republican proposal for more than 39 hours.
That proposal, Senate Joint Resolution 39, would protect "certain religious organizations and individuals" who refuse services or goods related to same-sex marriages or weddings.
Missouri Senate Democrats argue the proposal will codify discrimination into the state's constitution.
This issue has recently become a touchy topic, and other states have seen similar bills.
But how does the length of this marathon filibuster compare to others?
Missouri Senate Democrats led a 38-hour filibuster over an abortion bill in 1999.
Notable single-person filibusters include Texas state Sen. Wendy Davis' 11-hour stand against an abortion ban in 2013.
Former U.S. Sen. Strom Thurmond of South Carolina filibustered the Civil Rights Act of 1957 for 24 hours.
The longest filibuster on record goes to former U.S. Sen. Bill Meier of Texas, who filibustered a worker's compensation bill for 43 hours in 1977.