No, Bush and Blair took the world to war stone cold sober. Kennedy opposed the war drunk. His judgement drunk was better than theirs sober. Where his drinking (if it isn't just character- assassination and a coup-in-office by Campbell- remember, admit alcoholism and you're out, deny it and you're in denial and you're out) may have caused problems was in the low profile of the LibDems, the lack of aggressive presentation, the failure to press home points.

As for weight, what did Julius Caesar say?

And who was it proposed that the main qualification to be a leader should be that they don't WANT to be leader?