What political party did Grover Cleveland belong to?

Grover Cleveland was a democrat and served as the 22nd and 24th President of the United States. He was the only president to leave office and then return for a second term with someone else serving in between. He was known as an honest president and fought against corruption. He believed in limited government and vetoed a lot of legislation that Congress brought before him, but he did have several accomplishments while in office.
In 1887, Cleveland established the Interstate Commerce Commission to regulate the railroad industry and put an end to the monopolistic practices. In 1895, he intervened in the Venezuelan Crisis by adopting a broad interpretation of the Monroe Doctrine. His actions strengthened the relationship between the United States and Venezuela. Another one of his major accomplishments was strengthening the United States defense system. He worked on a program to update coastal fortification, and he modernized the navy.