"If you don't like Berkshire, don't buy it," Howard Buffett advised shareholders during an interview at Berkshire Hathaway's annual shareholder meeting in Omaha. Buffett, the director and potential successor to his father Warren Buffett's company, says he hated talking with irate shareholders when he was head of investor relations at a different company. After one investor called him 15 times, Buffett says he offered to buy his shares at 5 percent above value if he promised to stop calling. He also addressed questions regarding his father's support of President Obama and a higher tax rate, views he says have not hurt the company. Warren Buffett spoke to the issue as well, saying his duties don't force him to put his "citizenship in a blind trust."