Well, I guess it depends of what you expect to be "good". However, I could mention
"Andrés Manuel Lopez Obrador" at the 2006 Mexican elections.
"Luz Inacio Lula Da Silva" Brasilian president, in Brasil they have a very particular
way to manage their economy.
"Hugo Chavez" Well he is a rude man, but he has done some interesting things in order to improve the economy of his people.
"Evo Morales" President of Bolivia, he was a leader of the Union of "Cocaleros" the farmers that plant coca. (In Bolivia the coca was used since ancient times as a tea)
"Felipe Calderón" Mexican president, he is a conservative. He is fighting against drugs (i don't think he is doing well, because a man can not combat drugs with weapons, he must fight against drugs with "Education").
"Eduardo Galeano" is a southamerican writer that wrote "Las venas abiertas de América" (The open veins of America). This book was given to the president Obama by Hugo Chavez. (Very interesting book about the history of economics in the new world).
If you are interested in the politics and economy of latinamerican countries, you should read about the new organization of Latin American Countries that is coming soon.