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The Conservatives are wooing voters where they face a close fight with the Lib Dems and are also set to "expand the battleground" to Labour heartlands.They are mailing 500,000 homes to try to demonstrate they have modernised in areas like the environment.
Setting out their green agenda, the Lib Dems pledged to put protecting the environment at the heart of government.
Meanwhile, Lord Mandelson has rallied Labour supporters as the party prepares to set out plans to improve the NHS.
Tory leader David Cameron is expected to reinforce his party's green credentials, citing their support for new laws on climate change and opposition of a third runway at Heathrow as examples, at a press conference later.
It marks the start of an offensive on two fronts for the Conservatives, as they aim to extend their lead in the opinion polls.
While four polls in Sunday newspapers suggested the party has a clear lead, they still pointed to a hung parliament - with the Conservatives short of an overall majority.
Party sources say they are now hoping to attract those people considering voting Lib Dem by emphasising how the Conservatives have changed and by pointing out similarities between the two in policy on issues such as ID cards.
As well as attacking areas where the Lib Dems are strong, the Conservatives have told activists to "expand the battleground" to seats in traditional Labour heartlands.
The Tories are trying to exploit what they see as waning Labour support, with the party placed third in several polls, and are backing up their pitch with 2,200 new posters with around the country from Monday.
In other developments:
Children's Secretaryfor using a mobile phone while driving, it has emerged TheSNP says it is more than halfway to its target of raising £50,000 to fund legal actionaiming to force the BBC to include one of its members in Thursday's final prime ministerial debateLabour and the Tories have clashedover funding for free nursery provision Lib Dem leader Nick Clegg has urged voters to "seize the opportunity" to "set Britain on the road to a prosperous and green future" by backing his party.
He said Labour had "failed" on the environment and that the next government would be the last that is able to stop "dangerous" climate change.
"Don't settle for a Conservative Party that talks the talk on green issues, only to align themselves with climate change deniers in the European Parliament," he added.
The Green Party responded to Mr Clegg's assertion that they "cannot make a difference in Westminster" by calling his party the "biggest eco-charlatans on this part of the planet".
As Labour switch their focus to the NHS in England, with hints they will spell out their vision in even more detail than the manifesto, Business Secretary Lord Mandelson rallied party supporters.
Saying they were "in the fight for our political lives", he reminded them that a third of the electorate remained undecided.
"In his interviews, Nick Clegg has been making clear his hostility to Labour and his preference to side with the Tories in a coalition if this arises," he said.
'Arrogant' assumptions
"Or, in other words, vote Nick and get Dave and George," a reference to the Conservative leader and his shadow chancellor George Osborne.
On Sunday, Mr Clegg said the possibility of the prime minister remaining at No 10 even if his party were to poll only the third-highest number of votes was "preposterous".
He told the BBC it was "potty" Labour could get fewer votes than their rivals but still try to form a government.
However, when asked about such a scenario, Mr Brown replied: "I don't think that's going to happen.
"When the electorate make up their mind, we've got to accept the verdict," he told Dermot O'Leary in an interview to be broadcast on BBC3 on Wednesday.
He added that it would be "arrogant" to make assumptions about the situation after the election.
Mr Cameron again warned voters that a hung parliament would lead to weak government, saying it could lead to "bickering, argument, drift and dithering".This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.