[Protect the Bill of Rights]

Forgive my ignorance, but why? What makes this agreement between just a small number of Senators binding?

[ARCADIA]

What makes this agreement between just a small number of Senators binding?

This block of senators now control the Senate. Neither the Republicans nor the Democrats have enough votes to override their objection. While the document is not legally binding, it is politically binding. You cannot change your stance and violate the agreement without taking a serious hit in credibility. Why would anyone take you seriously, if you refuse to deliver on what you so publically signed onto.