1. Associated Press and Ted Hart. 2016. Anti-Portman Ads in Ohio Fault Timing of Ditching Trump. NBC4i.com. http://nbc4i.com/2016/10/10/anti-portman-ads-in-ohio-fault-timing-of-ditching-trump/ .
2. Balmert, Jessie. 2016. When friends become Foes: Ted Strickland’s Fundraising Woes. Cincinnati.com. http://www.cincinnati.com/story/news/politics/elections/2016/09/16/when-friends-become-foes-ted-stricklands-fundraising-woes/89544326/ .
3. Barone, Michael, Chuck MCutcheon, Sean Trende, and Josh Kraushaar with David Wasserman. 2013. The Almanac of American Politics. Chicago: University of Chicago Press.
4. Blake, Aaron. 2016. Nobody is Having a Better Election Year than Rob Portman. The Washington Post.
5. Center for Responsive Politics. 2016. Ohio Senate Race. OpenSecrets.org. https://www.opensecrets.org/races/summary.php?cycle=2016&id=OHS2 .