One aspect of the progress of the new farm bill is the existence of bi-partisanship. Here's a Politico story on the problems in the Senate with rice and peanuts. While there's tension in both Houses, the tension now is among the "Aggies", as Sen. Chambliss calls them. The Senators and Representatives with allegiances to different commodity groups are sparring, but I expect them to come together in the end.
There are the outliers who are moved by policy ideas, which can correlate to partisanship. A few Republican members oppose federal expenditures on agriculture, reflecting their general positions (and the lack, I suspect being cynical, of significant agriculture in their district.