Why Copenhagen must be the end of the beginning. Martin Wolf, FT.

Better news from the US jobs market. Jeff Zeleny, NYT.

How polarised is Amerca? Stuart Taylor, National Journal. Stuart writes about Morris Fiorina's new book.

The Senate: where progressive legislation goes to die. Alan Abramowitz, Crystal Ball. Abramowitz (who by the way has sparred with Fiorina over polarisation) asks why Senate Democrats don't just abolish the filibuster. He says they could do it by simple majority vote: "All it takes is the political will..." Is it quite that simple?

The filibuster and the constitution, part one. The filibuster and the constitution, part two. Vikram David Amar, FindLaw.