 His influence helped ensure that Connecticut ratified the Constitution, and he was elected as one of Connecticut's inaugural pair of Senators, serving from 1789 to 1796.He was the chief author of the Judiciary Act of 1789, which shaped the federal judiciary of the United States and established the Supreme Court's power to overturn state supreme court decisions that were contrary to the United States Constitution.Ellsworth served as a key Senate ally to Alexander Hamilton and aligned with the Federalist Party.