As the conference season ends, which leader faces the toughest task?

Ever since he burst onto the political scene during the Tory leadership election five years ago, David Cameron has consciously or otherwise modelled himself on Tony Blair.

To begin with, he appeared to invite the comparison, describing himself as the "heir to Blair" at a dinner with a group of newspaper executives in October 2005.

One of the newspaper editors present on that occasion reputedly warned him: "David, I would not repeat that outside this room," and to be fair to Mr Cameron, he took the advice.

But though the Prime Minister is nowadays more keen to play down the comparisons, this week's Conservative Conference in Birmingham showed they have not gone away.

Political blogger and former North-East Labour official Hopi Sen produced a fascinating comparative study of Mr Cameron's conference speech on Wednesday with Mr Blair's first address as Prime Minister in 1997.

For instance, in 1997, Mr Blair said: "When people say sorry, that’s too ambitious, it can’t be done, I say: this is not a sorry country, we are not a sorry people. It can be done."

Fast forward to this year, and Mr Cameron is telling us: "Don’t let the cynics say this is some unachievable, impossible dream that won’t work in the selfish 21st century – tell them people are hungry for it."

And as Hopi points out: "In Blair’s first speech we find a young girl who writes in to say how much she liked going to a summer camp. In Cameron’s a young girl writes in to help pay off the deficit."

But what really unites Messrs Cameron and Blair is not so much their shared rhetorical style or even their presentational skill, but their tendency to want to define themselves in opposition to their own parties.

Mr Blair loved nothing better than to don the Tories' clothes – whether it was being tough on crime, a hawk in international affairs, or even privatising public services when Gordon Brown would let him.

He knew it wound his party up – but that was fine so long as it showed the wider electorate that Labour was no longer hidebound by what he saw as out-of-date ideology.

Now we have Mr Cameron wanting to make 'fairness' the defining characteristic of his government – not a value with which the Tories have always been readily associated.

The Prime Minister knew that the decision to axe child benefit for households with a higher-rate taxpayer would wind-up his own grassroots – but what mattered was whether the wider public saw it as fair.

But did they? It certainly doesn't appear to be very "fair" to families with a single-earner in the higher tax bracket whose partner stays at home – and may well have to be rethought for that reason.

Culture secretary Jeremy Hunt then broadened the debate by raising the issue of whether the state should subsidise people who have more and more children.

Was it a gaffe - or was he acting as an 'outrider' for Mr Cameron, in the way that Stephen Byers and Alan Milburn sometimes used to do for Mr Blair, saying the things the leader dare not say himself?

Time will tell – but as the post-election conference season draws to a close, how do the three parties and their leaders currently stand?

Labour's Ed Miliband must persuade a sceptical public he is a better leader than his brother would have been. Nick Clegg has to win that referendum on voting reform, or risk the Lib Dems being flattened at the next election.

As for Mr Cameron, he must convince the voters that the most savage spending cuts to be unleashed for decades are somehow "fair."

It is hard to say which of the three of them faces the most difficult task.

Ed should think twice before he buries New Labour

Within hours of Ed Miliband's victory in the Labour leadership election last Saturday, friends of Tony Blair let it be known that the former PM regarded the result as a "disaster."

It was certainly pretty disastrous for Tony Blair. His ill-judged intervention in the contest, suggesting that any departure from New Labour would consign the party to the wilderness, appears to have spectacularly backfired.

Offered the chance to choose a Blairite continuity candidate in David Miliband, the comrades opted instead for someone who has spent most of his career as an adviser to Gordon Brown.

Mr Blair's autobiography may have topped the best-seller charts. But it has lost him any lingering influence he may have had over his old party.

But if this week's conference in Manchester was a disaster for the Blairites, how was it for the party as a whole?

Well, on this point, I'm afraid I find myself in rare agreement with the former Prime Minister.

Had David won, Labour would have been right back in the game. Unlike his younger brother, he is a man who is ready to be Prime Minister now, and his election would instantly have struck fear into the coalition.

Instead - and not for the first time in its history - the party has opted to eschew the easy route back to power in favour of the long, hard road.

To my mind, there are three principal reasons why Ed's victory may ultimately come to be seen as a bad day's work for the party.

The first is nothing to do with the qualities of Ed or David, but with the flawed system that enabled Ed to come out on top despite winning fewer votes from both party members and MPs.

Much has already been written about the dangers of Ed being seen to be in the "pockets" of the union bosses, and like many Labour leaders before him, he will have to work hard to tackle that perception.

To me, the bigger problem is not that the unions got their man, but that the party members didn't, creating an issue of legitimacy that Ed will struggle to address.

Secondly, there is Ed himself. He was right in his speech on Tuesday to try to draw a line under some of the issues which have caused Labour to suffer such a catastrophic loss of trust, and the 'Red Ed' jibes will soon be shown to be ludicrous.

But for all his personal ruthlessness in fighting his elder brother for the party leadership – and in despatching Nick Brown from the job of Chief Whip - he still comes across as rather earnest and well-meaning.

For me, though, the biggest danger for Ed is that, in displaying such ruthlessness in pursuit of the top job, he may have sown the seeds of his own downfall.

It is not just that in order to win the leadership he had to humiliate his elder brother and force him out of frontline politics, but that he also had to trash the entire New Labour brand.

Yes, there were things New Labour got wrong. It did become "fixed in its own certainties" as Ed said on Tuesday. The Blairites became, like Tony Crosland, revisionists who stopped revising.

And as the North-East knows only too well, it clearly failed to balance the interests of its traditional supporters against those of 'aspirational' voters.

But the essential lesson of New Labour – that to win, the party needs to reach out beyond its ideological comfort zone - is one Ed Miliband ignores at his peril.

And I am not alone in wondering whether in declaring New Labour 'dead,' he is not also in danger of writing his own political obituary.

Mutually assured destruction

Behind all the brave talk of new generations, it is my fairly considered view that this Labour conference has been little short of a disaster for the party.

The outcome of the leadership election, via a flawed system that appears to have awarded the prize to the less popular, as well as the less experienced brother, has overshadowed the whole week in Manchester.

Had David Miliband won, as once seemed his appointed destiny, then the week would surely have been a breeze.

Labour would have elected an oven-ready Prime Minister who would instantly have struck fear into the coalition. Instead, the party has opted to do it the hard way.

As I have written before, I don't think Ed Miliband's politics are the problem. He was right yesterday to have distanced himself from some of the issues which caused Labour to suffer such a catastrophic loss of trust at the last two elections, and the 'Red Ed' jibs of the right-wing press will soon be shown to be self-evidently ludicrous.

Another of his nicknames, 'Forrest Gump', is perhaps nearer the mark. The trouble with Ed for me is that, for all his personal ruthlessness in fighting his elder brother for the party leadership and humiliating him in the process, he still comes across as rather well-meaning and naive.

To the Blarites, he was neither Red Ed, nor Forrest Gump, but 'The Emissary from the Planet Fuck' - apparently a reference to the fact that he was the only leading Brownite they could speak to without being told to "fuck off."

This too is revealing. Ed Miliband effectively won this contest by being the acceptable face of Brownism - by contrast with Ed Balls who was seen as its unacceptable face.

But the real problem Ed has faced this week is the psychological outworking of his brother's humiliation, culminating in today's announcement that he will not serve under him.

It undoubtedly leaves Ed weakened, and leaves Labour's already depleted top team looking even more bereft of experience, but it is merely the price he is now having to pay for upsetting the natural order of things.

Ed should perhaps have given more thought to this before he entered a contest which he did not really need to enter - that in destroying his brother, he risked ultimately destroying himself.

This self-destruction is not just a matter of whether Ed can look himself in the mirror at 3am in the morning, but whether, in laying bare the divisions within Labour in order to grab the top job, he has ultimately fatally hobbled his own election chances.

It was for all these reasons, and also partly because Ed's victory has left me feeling rather disconnected from Labour, that I posted a picture of Yvette Cooper on this blog last night under the headline "Labour's next Prime Minister."

Okay, so five years is a long time in politics, and Ed will doubtless grow in stature during that time, but in the increasingly presidential nature of our election contests, he doesn't look or sound to me like a man who could beat David Cameron.

So Dave is in for two (fixed) terms, Labour will turn to someone else for 2020, and Yvette - who in my view could have won this time and spared us this whole psychodrama - will surely make Chuka Umunna wait a while longer.

It is surprising in many ways that we have not yet had a second woman Prime Minister. The 30th anniversary of Thatcher's overthrow would seem an appopriate year in which to remedy that.