I wrote a quick (and very dirty) R script for creating a comparison cloud and a commonality cloud for President Obama’s 2011 and 2012 State of the Union speeches. The cloud on the left shows words that have different frequencies between the two speeches and the cloud on the right shows the words in common between the two speeches. Here is a higher resolution version.
The focus on jobs hasn’t changed much. But it is interesting how the 2012 speech seems to focus more on practical issues (tax, pay, manufacturing, oil) versus more emotional issues in 2011 (future, schools, laughter, success, dream).
The wordcloud R package does all the heavy lifting.