Grover Cleveland
The president that was governor before he was elected was George W. Bush. He became the 43rd U.S. president and ran for two terms.
Grover Cleveland fits this description. We was mayor of Buffalo, NY and later the governor of New York and was noted as a reformer.
Canadian senators are appointed by the Prime Minister, they are not elected (although there are plans to reform the Senate).
Salvador Isabelino del Sagrado Corazón de Jesús Allende Gossens
President Wilson's reforms were the Tariff Reform, Business Reform, and the Banking Reform.
James A. Garfield was the 20th President of the United States, serving from March until September 1881, when he was assassinated. Before his presidency, he was a Civil War general and a prominent member of the House of Representatives. Chester A. Arthur, his vice president, became the 21st president after Garfield's death, serving from 1881 to 1885. Arthur is noted for his efforts in civil service reform, particularly the Pendleton Civil Service Reform Act.
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President Wilson contributed greatly to political science. President Wilson's ideas consisted of the tariff reform, the business reform, and the banking reform.
California governor Hiram Johnson
Civil Service reform.
Scott Walker