I just added the transcript for the Texas Democratic debate held on February 21, 2008 to the interactive Transcript Analyzer. The image below is smaller (and more blurry) than from the application but should give a rough idea of what was discussed by which candidate and when. Here are the primary topics covered in order:
Democrat Debate - Feb 21st, 2008
I did make a minor refinement to the application. The bars for the words of interest are now coloured to show the speaker. This makes it easy to tell, for example, that Obama used the word 'Iraq' in 7 separate segments but Clinton only used it in one segment.