Locked-out union workers at American Crystal Sugar Company have rejected the latest contract offer from the company. Union officials announced Tuesday that 92% of union members participated in the secret ballot, and 90% voted against the proposal. It’s the second time workers have rejected an offer. About 1,300 workers have been locked out since August 1st at plants in Minnesota, North Dakota and Iowa. The company is using replacement workers. The two sides met with a mediator last week.