Republicans have been the big business party for decades now.
http://en.wikipedia.org/wiki/Earl_Butz
"In 1971, President Richard Nixon appointed Butz as Secretary of Agriculture, a position in which he continued to serve after Nixon resigned in 1974 as the result of the Watergate scandal. In his time heading the USDA, Butz revolutionized federal agricultural policy and reengineered many New Deal era farm support programs. His mantra to farmers was "get big or get out," and he urged farmers to plant commodity crops like corn "from fencerow to fencerow." These policy shifts coincided with the rise of major agribusiness corporations, and the declining financial stability of the small family farm.
Butz took over the Department of Agriculture during the most recent period in American history that food prices climbed high enough to generate political heat.
In 1972, Russia, suffering disastrous harvests, purchased 30 million tons of American grain. Butz had helped to arrange that sale in the hope of giving a boost to crop prices in order to bring restive farmers tempted to vote for George McGovern into the Republican fold.[1]
He was featured in the documentary King Corn, highlighted as the person who started the rise of corn production, large commercial farms, and the abundance of corn in American diets."