How? Last I checked Democrats still won several elections without receiving the majority of rural votes. Instead, they can't simply rely on only winning the urban centers. Where as on the state level places like New York and California are run exclusively based on the whims of the major urban centers. Would you prefer to enable politicians to avoid the rural areas and the very different concerns in service of the urban areas which happen up have more people? As it stands the politicians must campaign in both areas if they want a chance.