The Constitution is the fundamental governing document of the United States. But to what extent do candidates and parties make constitutional arguments in the course of American elections? By examining party platforms, candidate messages, presidential debates, and television ads, The Constitution on the Campaign Trail answers that question, and the results are fascinating. Busch finds evidence for both a long, broad decline in the use of constitutional rhetoric since the mid-19th century and a limited resurgence in that rhetoric over the last four decades. The political analysis found here is firmly grounded in historical research and the conclusions reached are trenchant.