Why shouldn't we rank our pundits like athletes?

Wouldn't it be great if we measured the performance of political pundits like we do our sports stars? Why shouldn't we know ahead of time that the screaming political "expert" on cable or radio talk shows has been right only 10% of the time? 

Our friends at the always insightful "Freakonomics" radio show raise that very question in examining society's long history in predicting -- make that attempting to predict -- the future. 

Not to spoil the punch line, but odds are those "experts" will miss the mark, and often are no more accurate than a simple guess.