Left being a convienant descriptor and nothing else. In any case, Cami most elections are decided by so-called 'swing voters' which represents voters who shift with the political winds. There are always a solid core of people who will never vary their vote. Elections are not won by 'priming' the base, those who will already vote for you, but by appealing to swing voters preferably with cash inducements on or just before election day. 
