"Nader refuses to entertain any discussion of the real-world effects of his actions as presidential candidate in 2000, either as it affected the voting or in terms of the results of that campaign. He repeatedly blames Katherine Harris and the U.S. Supreme Court for the fact that Bush became President, while refusing to consider that had he not been in the race that Gore would probably have won New Hampshire and would have won Florida by a margin too great for Harris and Jeb Bush to undermine. He says little about what he would do as President, revealing that he has no expectation of winning. He repeatedly make the absurd claim that those who've implored him to not run are just "hostages to an antiquated winner-take-all system" trying to "deny democracy and free speech," when in reality they are just pointing out that millions of people could bear he costs of his irresponsible exercise of democracy and free speech. In essence, he's painted a picture of himself in as a martyr, but he refuses to see that his saintliness will result not in his sacrifice but in the sacrifice of the legislative and consumer protections he's achieved, the ideals he claims to embody and protect, and the people on whose behalf he claims to act."
This is a great entry. There's a section down below on how to determine whether someone really does have a calling to politics.