They'll be voting Tory because the majority of people will do as theyre told by The Mail and The S*n.
Who makes them buy the papers in the first place? It seems like a very impractical way of controlling huge sections of the population when all the people have to do is not buy those papers.
Maybe people just want to vote Tory and those are the papers that match their world view? If I made you read a copy of the Mail would it make you vote Tory?
Or is it your upbringing, your social and personal circumstances and other factors like your age and income that are the major factors in who you vote for?