Democracy in America is a blog by correspondents who write for The Economist.
Blogs and blog streams are regularly-updated sources of information. They are published by individuals, independent sources, mainstream media, students, professionals, or just about anyone. You want to get a sense of the role a blog holds in the public conversation before you rely heavily on it in your research.
Paul Krugman is a prize-winning economist who writes for The New York Times and teaches at Princeton University. He is the author of The Conscience of a Liberal.