In a closely fought battle, when hospital wards face closure in marginal seats, there will be irresistible temptation for Labour to make promises that can’t be kept.
The party's new attack video shows how it will maximise the damage for the PM by reminding voters how he promised in 2010 to protect the health service.
Contrary to the media scare stories, the actual cost of "health tourism" is estimated at £70m, just 0.06% of the NHS's annual budget.
The Home Secretary glossed over the fact that "health tourism" costs just 0.01% of the NHS budget.
The Business Secretary has long warned that ring-fencing some departments from cuts is not "a very sensible" approach.
To pretend that extra resources are not urgently needed in the NHS is to be as foolish as the courtiers in Hans Christian Andersen's fairy tale.
During a visit to the Olympic park, the PM is asked: "why are you privatising the NHS? Why are you lying to the British people?"
All three parties have colluded in the creation of ideal conditions for an unprecedented colonisation of the NHS by an aggressive, profit-seeking private sector. NHS SOS, a new book edited by Jacky Davis and Raymond Tallis, explains how it was done.
Bruce Keogh, the author of the report into 14 NHS trusts, writes: "Don’t believe everything you read, particularly in some newspapers."
The Tories' attempts to pin the blame for NHS failings on the former health secretary are both politically unwise and unmerited by the facts.