via speechwars.com
Here's a interesting tool at speechwars.com where you enter any word, for example, "challenge," "soul," etc. and you're given a graph of the number of times the word was used in various U.S. presidential speeches and the number of times each Prez (or nominee) said it. For example, since 1790 the word "love" has been used a total of 89 times in State of the Union addresses and Ronald Reagan used it the most (4 times).