Following the 1992 election, the Sun declared 'It's the Sun wot won it'.
Newspapers can run relentless political smear campaigns against party leaders; in the 1980s and 1990s, the Sun constantly attacked Neil Kinnock - even criticising his 1987 manifesto by saying 'Will the last one to leave please turn off the lights?.
At the 2017 election, 59% of The Sun readers voted Conservative.
At the 2017 election, 73% of The Guardian readers voted Labour.
Impact of press not substantial; at Leveson Inquiry, Murdoch admitted that newspapers do not change voter behaviour.
Echo chamber!