I've been saying, lately... That I'm tired of Democrats playing win-win while Republicans play zero sum. Even game theory 101 explains this problem. However, when Democrats start playing zero sum, then Republicans won't know what to do.
Don't know how win-win and zero sum interact? Here's a basic from stanford and yale
https://www.coursera.org/learn/game-theory-1?ranMID=40328&ranEAID=Cu8bOePBZBg&ranSiteID=Cu8bOePBZBg-lrZ3tnMH2vhXLkO7TaEM5A&siteID=Cu8bOePBZBg-lrZ3tnMH2vhXLkO7TaEM5A&utm_content=10&utm_medium=partners&utm_source=linkshare&utm_campaign=Cu8bOePBZBg
https://www.openculture.com/2017/04/an-introduction-to-game-theory-strategic-thinking-a-free-online-course-from-yale-university.html
And more free courses here: http://www.openculture.com/freeonlinecourses