Pressure has mounted on both sides of the border, and across the political aisle in Canada, for protesters blockading key crossings with the U.S. and others encamped by Parliament Hill to go home, or for officials to move them out of the way. Political patience with the protesters has run thin as vehicles choke the flow of goods at border crossings, including at Coutts, Alta., Emerson, Man., and the busy Windsor-Detroit Ambassador Bridge.