He was elected as a Republican to the U. S. Senate in 1874, defeating the incumbent Radical Republican Zachariah Chandler, and served in the 44th and 45th Congresses from March 4, 1875, to February 10, 1879, when he resigned due to ill health.

He was elected as a Republican to the U. S. Senate in February 1857, and served from March 4, 1857, to March 4, 1863.

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