Not sure that is quantifiable, but interesting perspective you brought.
It’s not quantifiable but it’s true. Even the left knows it’s true on some level. They are full of righteous hatred. That’s why they accuse us of hatred so often (in fact pretty much constantly).
Just one example of the difference between left and right: David Horowitz talks about how he was treated when he switched sides and became a conservative. His friends on the left, all the people had known for years, immediately “unpersoned” him. He was instantly, thoroughly, and viciously ostracized. He looked at rightwingers who had similarly defected to the left and found they were not treated nearly as badly. He goes into detail about this in his bio, Radical Son.
And here’s another, totally unscientific but I think pretty telling. Try googling the keywords “hope Clinton burns in hell” and “hope Bush burns in hell” and compare the number of hits. It’s interesting.
Another one — Jay Nordlinger has an interesting observation that he mentions from time to time about leftist audiences. They do something that no other group does: they hiss. They literally hiss their disapproval. Not a huge deal, but it indicates something. And look how leftists treat conservatives when they speak at universities. They shout them down and literally throw things at them. Does the right do that? Nope.
One other, and this is a good one. Check out this blog which compiled pics of leftist rally attendees with displays depicting or hoping for the death of George Bush:
http://www.zombietime.com/zomblog/?p=621
There is no equivalent of this on the right.