They argued in support of ratification (acceptance) through political essays called The Federalist Papers.
Explanation:
Alexander Hamilton and James Madison, along with John Jay, were Federalists that strongly favored the ratification of the newly proposed U.S. Constitution. In order to gain support for its ratification, they wrote a series of 85 essays in 1787 that addressed constitutional principles and explained the deficiencies of the Articles of Confederation (the former U.S. Constitution) and the details of the new Constitution, arguing that its ratification would preserve the Union and empower the federal government to act firmly and coherently in the national interest. This collection of essays were known as The Federalist Papers.
He used his political ties to push programs through bipartisan support including his acts on Civil Rights and Medicare/Medicaid. He helped pass the Voting Act of 1965