David Cameron in front of a double rainbow as he campaigns in Devon
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Election 2015: Cameron's final campaign push

As the election draws ever nearer, the Conservative Party leader, David Cameron, spent Tuesday on a 36-hour, non-stop campaign trail.

Campaigning in London and the South West of England he said only a Conservative government could keep the country moving forward.

And he warned that a government formed by a party that did not have the most seats would have a "massive credibility problem".

Gavin Hewitt reports.

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