The American Conservative Union (ACU) is a prominent political organization in the United States that advocates for conservative principles. Founded in 1964, it aims to promote limited government, free markets, and individual liberties. The ACU is known for hosting the annual Conservative Political Action Conference (CPAC), which gathers conservative leaders and activists to discuss policies and strategies. The ACU also plays a significant role in political activism by rating lawmakers based on their voting records on key issues. This rating system helps inform voters about how well their representatives align with conservative values, influencing elections and public policy discussions across the country.