Found this interesting
http://thefederalist.com/2017/04/26/dartmouth-study-finds-democrats-least-tolerant-students-campus/
On one college campus, self reporting.
Consider the source.
I’d suggest reading the article in The Dartmouth, in which someone points out that since Republicans are a minority, they are more likely to have lived with a person of another party and thus are aware that they will survive it. 
“Study” good grief…
Here’s the original article talking about the results of one survey from Dartmouth: http://www.thedartmouth.com/article/2017/04/a-survey-of-dartmouths-political-landscape
I’m finally starting to understand what “fake news” is.
Moderator’s note
No politics!!