While the biodiesel tax credit has been extended retroactively in the past, it has had a unique impact.The Senate Finance Committee considered and passed its tax extender package yesterday that included the $1.00 per gallon biodiesel blenders' tax credit, the 10 cents per gallon agri-biodiesel producer tax credit and the $1.01 per gallon cellulosic biofuels producer credit. These are all retroactive to the beginning of 2014 and in effect through 2015. If finally accepted, this would be the second time that the biodiesel tax credit was approved retroactively. At the end of 2012, it was extended back to cover that year after it had lapsed in 2011 and also effective until the end of 2013 when it expired.The Finance Committee package did not in...