They went back and forth over whether Colorado should post a bid for the 20-30 Winter Olympics. The debate played out in a public meeting yesterday at Park Hill Congregational Church. Opponents of the idea included former Governor Dick Lamm, who pushed a referendum that scuttled the Winter Olympics for Colorado in 19-76. Opponents' concerns include cost and environmental impact. An exploratory committee says it hasn't come to a conclusion. The Post reports that committee will present its report to the governor and Denver mayor next month.