I have taken the words spoken by both Obama and Clinton during the Pennsylvanian Democratic debate held on April 16th, 2008 and constructed from them a Document Cloud Comparison. Basically, it lets you see which words were used together by each speaker using linked word clouds. A few static images are shown below to give you a flavour but the real fun comes with exploring the interactive application.
If you enter a blank focus string in the application it shows a standard word cloud and colors words that are unique to one speaker or the other. The top words used by Obama and not by Clinton include 'politics' , 'decade', 'election', 'economic', 'somehow', 'generation' , 'mission', 'forward', and 'problem' . Those used by Clinton uniquely include 'york', 'begin', 'world', 'best', 'support', 'administration', 'police', and 'hope'.
'Country' Associations and References (static image)
'jobs' Associations and References (static image)
Give it a try yourself. The application is written in Java so you may have to wait a few seconds for it to start up.
The interactive application: