Ed Miliband has vowed to "fight for what he believes in" after the Labour Party dropped in the polls, throwing him into a leadership "crisis".
The Labour leader told the BBC that he "absolutely" sees a Prime Minister when he looks in the mirror in the morning.
"My job, and what I'm going to do, is to go out and fight for what I believe in," Miliband said.
"It's why I stood for the leadership – we've got to be a country that works for ordinary people again."
The comments come after an alleged leadership "crisis" for Miliband and also followed a poll from Ipsos MORI that revealed the Conservatives have taken a three-point lead ahead of the 2015 General Election next may.
"It is fair to say that we haven't had the best couple of weeks," the Labour leader said.
"Disunited parties are parties that the public worry about and I understand that, that's why we are going to go forward as a united party.
"That's why the feeling right across our party, the vast, vast majority of people is we are going to look outwards to the country and I'm very clear about that.
"We are going to fight for what we believe in, we are going to focus on the needs of the country, we are not going to look inwards as a party because, frankly, it would be unforgiveable."
Miliband is expected to make a speech at the University of London on 13 November.
The Labour leader will say that Labour's economic plans will be delivered through "big reform" rather than "big spending".
"We will be the wealth creators, not just the wealth distributors; the devolvers of power, not the centralisers, and the reformers of the state, not the defenders of it," Miliband is expected to say.
"People [are] asking why they are on zero-hours contracts while those at the top get away with zero tax.
"This zero-zero economy is a symptom of a deeply unequal, deeply unfair, deeply unjust country; a country I am determined to change."