The ranchers whose legal troubles sparked the occupation of a federal building in a Oregon wildlife reserve will ask President Obama for clemency, their lawyers announced Monday. The ranchers—Dwight and Steven Hammond—turned themselves into prison Monday to begin a second sentence for arson. Both men are returning to prison after their earlier sentences were ruled to have been illegal. Federal authorities say the Hammonds set a fire to cover up poaching. The father and son maintain that they were trying to eradicate invasive species and prevent wildfires.