Warren Buffett’s Berkshire Hathaway recently terminated credit default swaps it had made insuring $8.25 billion in municipal debt. Here, Colin Barr of The Wall Street Journal discusses Berkshire’s muni move, and what it may mean for municipal bonds in general. “You can read this to say this guy who has a lot of knowledge of this area is saying, ‘The risks are mounting,'” Barr says. But Barr adds that muni bond fears have been in effect for some time, and haven’t quite materialized yet.