Roberto Sánchez Vilella was the governor of Puerto Rico from 1965 to 1969. Sánchez Vilella successfully ran for governor in the 1964 elections for the Partido Popular Democrático. He is also the founder of the People's Party, "Partido del Pueblo", also known as el Partido del Sol.

The Popular Democratic Party is a political party in Puerto Rico that advocates to continue as a Commonwealth of the United States with self-governance. The party was founded in 1938 by dissidents from the Puerto Rican Liberal Party and the Unionist Party and originally promoted policies on the center-left. In recent years, however, its leaders have described the party as centrist.