Who are the most credible advocates for raising taxes on the super-rich?

The super-rich, of course.

Warren Buffett, one of the most ethical human beings in America, argues in the New York Times for a tax increase on himself and his peers. It's a shame that most of those at the top of the income bracket don't share Buffett's sense of philanthropy and social responsibility.

Best line from the article:

These and other blessings are showered upon us by legislators in Washington who feel compelled to protect us, much as if we were spotted owls or some other endangered species. It’s nice to have friends in high places.