Which political program did Newt Gingrich use to gain significant congressional power in the 1990s?

Newt Gingrich utilized "The Contract with America" as his political program to gain significant congressional power during the 1990s. This initiative was instrumental in the Republican Party's strategy to capitalize on public dissatisfaction with the Democratic majority and was a key factor in the Republican Revolution of 1994.

The Contract outlined a series of proposed legislative reforms that included tax cuts, crime reduction measures, welfare reform, and term limits for members of Congress. It effectively presented a clear and cohesive agenda that resonated with voters, contributing to the Republican takeover of the House of Representatives in the 1994 midterm elections. Gingrich's ability to mobilize support around this set of initiatives showcased effective political organization and communication, leading to a transformative moment in American politics.

The other options, such as The New Deal and The Fair Deal, were significant political programs of earlier decades, associated with Franklin D. Roosevelt and Harry S. Truman respectively, and thus were not relevant to the context of Gingrich's influence in the 1990s. The Affordable Care Act is a policy from a later period and does not relate directly to Gingrich's tenure or strategies during that time.