Warren Buffett: Baptist and Bootlegger reason.com
How America’s favorite billionaire plays politics to make money
Again, to be clear, even though Buffett was the one who proposed the public-private partnership, there is absolutely nothing illegal about lobbying for a policy while investing in the companies that stand to gain most if that policy is adopted. But consider this: Had Buffett instead pushed a private investment house to make an acquisition that would benefit certain stocks while quietly buying shares in those same stocks, he would have been vulnerable to charges of insider trading.
(above quotes are excerpts)