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The 'Big Four' Newspapers

New York Times- Great for analysis, particularly on education. Liberal.
Wall Street Journal- Economic authority. Conservative.
Christian Science Monitor- Underrated.
Washington Post- A great spot for politics.

Other Newspapers
Politico
Chicago Tribune
Miami Herald- The authority on Latin America.
Boston Globe 

Houston Chronicle

 

Biased Sources: Left or Right?

 

Brookings Institute- The most powerful think tank in the US.
Democracy Now- The leading independent media outlet in the world.
Noam Chomsky- The most cited and greatest intellectual alive.

The Heritage Foundation- Produces daily breifs with a conservative slant
The Cato Institute- Very libertarian.
The Atlantic- A Great source with original analysis.

 

Magazines

 

The Economist- One of the best sources known. It is the foremost news magazine in the world, and a supurb choice.

'Big Three'
Time
US News and World Report
Newsweek

Also check out...
Business Week
Mother Jones- Very liberal.
The New Republic

 

Other Great Sources

American Enterprise Institute- Centrist think tank with great data. 
Economic Policy Institute
Real Clear Politics- Links to outstanding columns. Highly recommended.