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Philip Francis Thomas (September 12, 1810 – October 2, 1890) was an American lawyer, mathematician and politician. He served in the Maryland House of Delegates, was the 28th Governor of Maryland from 1848 to 1851, and was Comptroller of Maryland from 1851 to 1853. He was appointed as the 23rd United States Secretary of the Treasury in 1860 in the Buchanan administration. After unsuccessfully standing for the United States Senate in 1878, he returned to the Maryland House of Delegates, and later resumed the practice of law.
Thomas was also elected twice to the United States House of Representatives, once in 1838 and again in 1874. He holds the all-time record for the longest break in between two terms of service in Congress, with 34 years separating his only two terms.