David Miliband; The Next Prime Minister?

Was David Miliband's recent newspaper article, and subsequent radio appearance a test of support for a potential leadership challenge to Gordon Brown? I fail to see what else it could possibly have been.

Apparently, the reason for writing was down to the sense of fatalism in the labour party. Following the article he has consistently used words such as can, could, when answering if he backs Gordon Brown, and if he thinks Gordon will lead labour into the next General Election. In addition to this he never really backed Gordon in his radio appearance.

Time will tell what the long term plan is for the current Foreign Secretary, but I can see it being turbulent for Prime Minister.