The book itself contains an appendix which shows the analysis. It doesn't seem to have been published as a journal article, but it is based on publically availa

The book itself contains an appendix which shows the analysis. It doesn't seem to have been published as a journal article, but it is based on publically available data and basically the same argument was put forth by the author of the book in an article on ProPublica. https://www.propublica.org/article/rare-agreement-obama-romney-ryan-endorse-retraining-for-jobless-but-are-the https://www.propublica.org/article/rare-agreement-obama-romn...