If you've never played around with Wordle
, it's "a toy for generating 'word clouds' from text that you provide. The clouds give greater prominence to words that appear more frequently in the source text."
One blogger made
six word clouds of 9-12 speeches from Presidents Washington, Jefferson, Lincoln, Nixon, Bush 2, and Obama. It's hardly a representative sample of presidents, but it's interesting to see which words were favored over time.