Northeast dairy farmers who have been strapped for months by low milk prices say a voluntary insurance program that was supposed to be a safety net isn’t helping. The margin protection program provides financial assistance to enrolled farmers when the gap between the price of milk and national average feed costs falls below the coverage levels picked by individual farmers. […] Farmers say the margin protection program is not based on Northeast farmers’ feed costs but on the national average feed cost, which is less. The chairman of the National Milk Producers Federation testified in Washington last month that the...