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David Cameron would need to win marginal seats such as Bolton West to return as a majority government at the 2015 general election.
Labour held the seat in 2010 with a margin of just 92 votes.
Deputy Editor Chris Ship visited the constituency today to look at his chances of winning over floating voters there.
Plans to withdraw housing benefit from under-25s were first floated at last year's Conservative conference, when the measure was estimated to save a possible £2 billion.
But today it was revealed that a sweeping range of benefits could be taken away from young people who are not in work, education or an apprenticeship.
The Prime Minister warned that there will be no option of a life on the dole for under-25s, telling the Conservative Party conference that he wanted all of them "earning or learning".
Full details of the reforms are expected to be included in the Tory manifesto for the 2015 election.
But Downing Street aides said that young people who are not in work, education or an apprenticeship and decline to take up training places can be expected to lose their automatic entitlement to benefits including jobseekers' allowance and housing benefit.
Labour MP Michael Dugher has said that the "land of opportunity" that David Cameron refers to is only for the "privileged few".
TUC General Secretary Frances O’Grady said that David Cameron failed to address the "living standards crisis," minimum wage and "living wage".
Labour leader Ed Miliband has responded to the Prime Minister's conference speech on Twitter:
Casting the Conservatives as the party for people who want to work hard, Cameron says "yes the land of despair was Labour, but the Land of Hope is Tory".
He final words: "Together we have made it this far, together we will finish what we have started and together we will build that land of opportunity".
There's the central message, "The land of despair was Labour, but the land of hope is Tory."
I'm sure everyone gets the rhyme too. Then, to loud applause, Mr Cameron says he doesn't want another coalition.
Latest ITV News reports
The Prime Minister asked today for the Conservatives to be given the chance to "finish the job we've started".
David Cameron appeared fired up in his speech to the Tory conference, but he must not underestimate some of Labour's populist policies.