Obama's 2015 Budget Backs Costly Corn Ethanol Subsidies - US News
Lots of reading on this one, but you can go straight to item 18 on page 236. http://www.gpo.gov/fdsys/pkg/BUDGET-2015-PER/pdf/BUDGET-2015-PER.pdf
The other quote that you have for the 2015 budget, was "a proposal" only for installing blender pumps. This money, if funded, goes to fuel sellers, only if they install a blender pump (a pump capable of dispensing from E0, E10, E15, E 20, E30, E 50 and E85 from the same pump). The only such subsidy for blender pumps in Nebraska that I am aware of is from the Nebraska Corn Board, not the US Govt. Read the rest of the article & it is all "old" news, but does talk about the Govt subsidies that ended in 2011.
I did look. I did not find any item 18 on page 236. I did find an item 18 on a different page that was "bio-diesel"