Berkshire's Buffett Responds to Kaminsky's Comments

CNBC's Melissa Lee reports on a letter from Warren Buffett regarding comments made by Gary Kaminsky, who was critical of Berkshire Hathaway's purchase of more than $1 billion of its own shares from the estate of a long-time shareholder. Kaminsky suggested the buyback may have been motivated by lower tax rates this year. Buffett took issue with Kaminsky's comments.