Cameron pledges to protect vulnerable
Mr Cameron said that Labour and Liberal Democrat proposals to delay action on the national debt would put society's most vulnerable at risk and said he would act "reasonably" if Thursday's election produced a hung parliament.
On the same day the Prime Minister Gordon Brown said 2010 would be the "year of Conservative cuts" if they were elected, saying their policies would cause a double dip recession.
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Hide AdSpeaking in Newquay, Cornwall Mr Cameron told supporters: "The test of a good society is how do you protect the poorest, the most vulnerable, the elderly, the frail.
"That's important in good times, it's even more important in difficult times. People need to know that if they have me as their Prime Minister and they have a Conservative government, it will be that sort of Prime Minister."
Speaking earlier on BBC1's The Andrew Marr Show he said he would act only "in the national interest".
Campaigning in London with four days left before polling day, the Prime Minister told supporters he was fighting for Labour "prosperity" versus Tory cuts.
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Hide AdMaintaining his campaigning message of fairness, Mr Brown said: "I'm fighting for my life, but I'm not fighting for myself. I'm fighting for the British people."
Later at the New Testament Church of God, Streatham, he told the congregation: "Our duty is to help each other. Deep down in is our DNA, we feel the pain of others."