How Jeremy Corbyn's impressive campaign led to huge Labour gains

Jeremy Corbyn executed a simple strategy very effectively and it has resulted in a brilliant set of results for the Labour Party, writes Benedict Pringle, founder of politicaladvertising.co.uk.
There is a regularly held perspective among the political commentator class that “campaigns don’t matter”.  The argument is that the fundamentals of the campaign are set months, even years, ahead of polling day and that the campaigns run by our political parties are frivolous a