Well.....I certainly won't argue that FDR did a lot of damage with his policies, not only with social programs, but with farmers as well. That said, the vast majority of his farm policies no longer exist.
As I stated in the other thread, I'm far less concerned about past policies than I am seeing the farmers branded as gross recipients of Federal subsidies......they are generally not interested in subsidies, because as with all things "government" they come with strings attached that compromise making good business decisions regarding land use, and crop placement and yield.
Going back to the top of your post, I think that the first thing that we need to define is exactly what is a "farm", what size must it be to be profitable, and how is it structured today as opposed to a half century ago.
When I was a kid growing up in the 50's and 60's, a farmer could make a living on a 150 to 200 acre farm, with a mixture of grain farming, and some livestock. During that same period, that same farmer could buy a tractor, plow, planter, cultivator, and a small combine for less than $10,000. Purchased on credit, the farmer (assuming no total crop failures.....a big IF), could keep up the payments and feed his family. Bear in mind that during this period.....continuing up through the late 80's,, over 80% of the farmland in the US was owned "free and clear"......no mortgages).........this was a hard lesson learned by farmers during the depression. Pay for the land FIRST.
Over the decades the size of a "family farm" has increased steadily, from around 200 acres, to now well over a thousand. The reason for this is simple........the cost of farm equipment has increased in a logarithmic curve. In order to support the investment in equipment, farms have been forced to become larger and much more efficient. The tractor that one could purchase for $2000 in 1965 will cost you well over $300,000 now. You might compare that to the price of a new automobile in 1965.....about the same $2000, and to replace tom today will run you $30,000.......a significant difference in cost escalation.
The other farming myth is the "corporate farm".........many think that the big Ag companies own and operate much of the US farmland. It isn't true........certainly ConAgra, Ralston-Parina, Green Giant, etc, do operate some farms.....mostly for specialized products and experimentation. The myth of the "corporate farm" comes from the fact that many farmers form corporations for tax and liability reasons, just like other small businesses do. Therefore when some idiot politician wants to complain about corporate farming, they are looking at land that is owned by "John Dow, LLC", and lumping all of those in with the large companies that operate farms as well. Large Ag corporations generally LEASE/RENT land, they don't buy it, they have far more profitable uses for their capital resources.
As to your point about our 880 acres being a "large farm".......it is actually quite small by today's standards from the point of view of supporting the investment required to operate it. Our next-door neighbor (a family farmer) plants over 10,000 acres per year.......with just two brothers, three sons, and two hired hands. THIS is what a family farm is today........and they are also a "corporation".
As far as going through and researching each of your citations point by point, which I simply don't have time to do, I'll just refer back to my direct experience as a farm operator and state that the "farm subsidies" that are generally discussed are largely not descriptive of direct payments to farmers.........they describe the vast budgets of the Department of Agriculture, the FDA, and to an extent the EPA, all of which attempt to inject themselves in to the Ag business. It is true that "price floors" have been established for commodity grain production, but some research will show you that grain prices haven't dropped below the "floor" for over two decades. The DoA also provides farmers with "crop insurance", which is designed to mitigate the impact of disastrous crop failures.......participation in this is "optional", and we actually have to PAY for the coverage with a percentage of the crop if it DOESN"T fail.......it ain't free, and the taxpayers are not paying for it, the farmers are.
Addressing the politics of farmers (I'm going to eliminate Minnesota and Wisconsin from the discussion, as Minnesota is an anomaly......a generally weird place politically, you'll recall that they actually elected Jesse Ventura Governor). The "politics" of farmers has changed over the past fifty years in the same manner as the rest of the general population. Farmers being a generally conservative group, back in the 50's, 60's, and into the 70's saw the Democrats as the party of the "little guy" which they identified with. As the Democratic party evolved leftward during and after the Vietnam war, and became representative of simply a number of left to far-left special interest groups, the farmers left........in the words of a former politician from Georgia, "I didn't leave the Democratic Party, it left ME......" I didn't read all of it, but you spent a lot of print discussing Illinois.....although Illinois is a large agricultural state, its politics are controlled by ONE GROUP......Cook County. The vast majority of the state's population lives in Cook County, and it therefore controls the makeup of the representation in the state government. Even with that considered, Illinois elected a Republican Senator, and came within a hair of having a Republican Governor.
One also has to look at the TYPE of Democrats that come from the midwest farming states.........they are virtually all "blue dogs", that run as conservatives in general elections.......it wasn't until the Pelosi era in congress that the voters woke up and discovered that the "blue dogs" would vote with the liberals when the chips were down.......here in Missouri after the last election that left only TWO Democrat representatives in Congress.....and veto-proof Republican majorities in the state legislature. Same in Kansas and Nebraska.
I also won't argue that ethanol for fuel is a farce.......there is an entire thread somewhere else on that subject. However, even your wiki source states that the subsidies for ethanol production go to the producers of ethanol, and not the grain farmers. They (the farmers) DO benefit from higher prices for their crops, but not through direct subsidues for the production of corn.
doc