Thanks for the suggestion. I've added your benchmark suggestion (along with a bunch of other fixes and new data like a 2008 RMSE benchmark along the lines of your Brier suggestion) into the R document: https://docs.google.com/document/d/1Rnmx8UZAe25YdxkVQbIVwBI0...

(I don't know when the new numbers will go live on the blog; Luke handles that.)