Where are they getting these farmers? There is no way any farmer with a brain would support the unions on this.
A good portion of their heirs still retain the socialist ideology and voting patterns of their European predecessors.
For example, my grandfather immigrated from Naumburg in the late 1800's and settled in a Chicago suburb, a baker by trade. He and my great-uncle plus a goodly portion of the old-country German, Austrian, Bavarian and Alsatian immigrants populating their suburb voted every four years for the perennial socialist presidential candidate, Norman Thomas.
A socialist vote made sense for grandpa and these politically-ignorant folks of the era because of the bad conditions they had just left over the sea and which prompted them to leave in the first place.
Today there's no excuse for these Wisconsin farming descendents to continue supporting socialists and their union kin, but they still do....if not for the memory of Norman Thomas, but for the memory of their gods, FDR, JFK and LBJ.
Grandpa DID wise up, owned a well-known and prosperous bakery for 40 years, and voted Republican till the day he went to apple strudel heaven.
Anyway, this will at least in part explain the presence of a lot of the farmers and tractors that will be in the socialist highway cavalcade today.
Leni