Scott Kilman and Roger Thurow:

A movement to uproot crop subsidies, which have been worth nearly $600 billion to U.S. farmers over the decades, is gaining ground in some unlikely places — including down on the farm.

In Iowa, one of the most heavily subsidized states, a Republican running to be state agriculture secretary is telling big farmers they should get smaller checks. Mark W. Leonard, who collects subsidies himself and campaigns in a white cowboy hat, told a room full of farmers recently that federal payments spur overproduction, which depresses prices for poor growers overseas.

“From a Christian standpoint, what it is doing to Africa tugs at your heartstrings,” Mr. Leonard told them. Last year, he helped humanitarian group Oxfam International in its anti-subsidy campaign by escorting a cotton farmer from Mali to church gatherings near his farm in Holstein.