Actually, it's Nader who should be backing up claims. I'd like to now how he comes up with "In the United States, the majority of citizens, physicians, and nurses prefer the Canadian type system – single-payer, free choice of doctor and hospital , everybody in, nobody out." As much as I would like for that to be true, I have never seen any poll to suggest that it is.
If I claim a person is delusional it is a matter of opinion. Same with his arrogance. I'm not sure what kind of statistic you're expecting to make you happy, but based on other posts you've made, I'm pretty sure you can satisfy yourself with a little bit of Google. There are plenty of people in the world who agree with Nader in most matters of principle (like me) but still think he's an ***.