How does the union of farmers and workers, called for in the Omaha Platform, differ from coalescence of corporate power, which the Omaha Platform...

The Omaha Platform was adopted by the first convention of the People's Party, commonly called the Populists, in 1892. Many of the demands that the platform included, such as the eight-hour work day, the graduated income tax, and the direct election of senators (as opposed to the selection of senators by state legislatures, as was then the law), became reality over the next few decades.

The Omaha Platform also called for the cooperation of unions...

The Omaha Platform was adopted by the first convention of the People's Party, commonly called the Populists, in 1892. Many of the demands that the platform included, such as the eight-hour work day, the graduated income tax, and the direct election of senators (as opposed to the selection of senators by state legislatures, as was then the law), became reality over the next few decades.

The Omaha Platform also called for the cooperation of unions and farmers. The platform noted that there were two classes at the time--"tramps and millionaires," and blamed the poverty of the workers and farmers on the collection of money in the hands of capitalists. The platform notes that these capitalists now controlled most of the nation's land, while urban workers were not allowed to organize into unions and poor immigrants were taking their jobs. The platform recognized that workers and farmers had a shared interest in uniting to beat back the power of the capitalists. One of the ways they sought to unite the interests of these groups was through the "free" coinage of silver, meaning that silver, in addition to gold (which was already used), would become legal currency. This would make it easier for farmers and workers to pay off their debt and pay for goods, as the silver standard would inflate the currency. 

The combination of workers and farmers would be different than the coalescence of corporate powers, as the workers and farmers would be able to be paid for the fruits of their labor. In addition, they would together represent a much larger portion of the population whose power would come from their numbers, not from their elite status (which was the source of the capitalists' powers).