Answer:
This is an example of republicanism.
Step-by-step explanation:
Republicanism argues that a nation is governed as a republic, that is, republicanism states that a nation should be governed as a republic where the head of state is chosen by non-hereditary means and defends the interests of the nation, as well as those who were elected to represent political office. In a nutshell, in a republic politicians must meet the interests of their constituents.
The paragraph shown in the question above represents an example of republicanism, because the senator changed his mind about the bill he would refuse, because his voters showed interest in that bill.