Might not be the best one, but The Economist quite decently introduces us to many political issues around the world.
MSNBC, nytimes.com, washingtonpost.com, politico.com, thedailybeast.com, and fox news. I check out Fox because they will have the GOP and rightwing viewpoints featured prominently. Sometimes Fox has some things you won't see elsewhere, but usually I marvel at how one-sided, misleading and prejudiced the "conservatives" are. By prejudiced, I mean: how much they distort and throw hate at Democrats and the left.