[quote name='dafoomie'] Uncle Tom endured slavery all of his life and yet remained loyal to his oppressors, and he's accusing Obama of enduring poverty only to be subservient to corporate interests, essentially betraying his own (the poor). [/QUOTE]
It's not the denotation. It's the connotation - what the words imply due to social constructs.
There's lots of ways to make points without using charged words. Nader used one. Sorry, but since it's an opinion, it's allowed to be analyzed with subjective undertones, and that's the damn deal here.
You can't just use a word that at some point garnered a reputation for having certain associations, especially if they were racial in nature. Those things stick. That's the funny thing about language - in 5, 10, 50 years, words will have evolved to have new meanings, both in denotation and connotation.
It's silly to act like he said a one-dimensional thing. That's naive. People aren't up in arms on this comment because by pure definition it contains nothing implied, they are pointing out that it does have something that's affiliated with a racist background.