Original: Albert Dean Rosellini ( born January 21 , 1910 ) was the 15th Governor of the state of Washington for two terms from 1957 to 1965 and was the first Italian American , Roman Catholic governor elected west of the Mississippi River .
Simplified: He is the oldest living person to have been a governor of a U.S. state , and was the first Italian American Catholic to become a governor of a state west of the Mississippi River .