C. S. Quay was an American politician who served as a U.S. Senator from Pennsylvania from 1887 to 1899. He was a prominent member of the Republican Party and played a significant role in state and national politics during his time. Quay was known for his influence in the Republican Party and his ability to navigate complex political landscapes. In addition to his Senate career, Quay served as the Governor of Pennsylvania from 1887 to 1888. He was involved in various political activities, including party organization and fundraising. Quay's legacy is marked by his contributions to the development of the Republican Party in the late 19th century.