GMO labeling is set to become effective in the state of Vermont this July 1 and as a result, Congress is moving much more quickly than usual in order to forestall a patchwork of state laws and regulations over genetically modified organisms (GMO).  This week, the US Senate began debating a federal voluntary labeling bill which is being pushed largely as a vehicle to preempt individual states from enacting their own mandatory GMO labeling requirements.  The debate continues with many different players taking a host of varying positions.  The Corn Refiners Association released a study this week indicating that mandatory labeling will hike an average family’s food bill by $1,000 per year.  Conversely, Campbell’s had previously announced support for mandatory labeling and claims labeling won’t increase food costs at all.  Maine and Connecticut both have GMO laws on the books, but they’re not effective until contiguous states require GMO labeling.