http://en.wikipedia.org/wiki/Matthew_H._Carpenter

Matthew Hale Carpenter (born Decatur Merritt Hammond Carpenter; December 22, 1824 – February 24, 1881), was a member of the Republican Party who served in the United States Senate for the state of Wisconsin from 1869–1875 and again from 1879–1881.

Carpenter was born in Moretown, Vermont. He served as District Attorney of Rock County, Wisconsin, from 1850 to 1854. He was originally a member of the Democratic Party until the start of the Civil War. While in the United States Senate, he served as the President pro tempore during the 43rd Congress. Carpenter died in Washington, D.C., while in office and was buried at Forest Home Cemetery in Milwaukee, Wisconsin.

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CARPENTER, Matthew Hale, a Senator from Wisconsin; born Decatur Merritt Hammond Carpenter in Moretown, Washington County, Vt., December 22, 1824; attended the common schools; entered the United States Military Academy at West Point in 1843 and remained two years; studied law; admitted to the bar in 1847 and practiced in Boston, Mass.; moved to Beloit, Wis., in 1848 and became known as Matthew Hale Carpenter; district attorney of Rock County 1850-1854; moved to Milwaukee in 1858; belonged to the Douglas wing of the Democratic Party until the commencement of the Civil War; elected as a Republican to the United States Senate and served from March 4, 1869, to March 3, 1875; unsuccessful candidate for reelection in 1875; served as President pro tempore of the Senate during the Forty-third Congress; chairman, Committee on Enrolled Bills (Forty-second Congress), Committee to Audit and Control the Contingent Expense (Forty-second and Forty-third Congresses); resumed the practice of law in Washington and in Milwaukee; again elected as a Republican to the United States Senate and served from March 4, 1879, until his death in Washington, D.C., February 24, 1881; interment in Forest Home Cemetery, Milwaukee, Wis.