They need to convince voters that the politics of Britain are not confined to a debate between the coalition parties.
In the tribal politics of Britain, it will never come to that.
Dr. Glen Newey, a professor of politics at Britain's Keele University, told CNN that politicians telling whoppers often act as barometers of functioning democracy, indicating that a demanding press and public are capable of steering politicians into stormy seas.
One only has to look at a Hogarth print or read Alan Clark's diaries for a dim view of politics in Britain.
About 100 yards from where Ed Miliband will deliver his speech is one of the most significant sites in the history of politics in Britain.
And the mainstream political parties should already be thinking about the implications of the rise of ethnic politics in Britain.
His failure badly undermined the credibility of the upper class that was dominating not just politics in Britain, but many other aspects of public life as well, including the media.
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Thatcher's death brought a flood of remembrances of how she reshaped modern Britain's politics and economy with some tart reminders of the ways in which she divided the public.
However Mr Mitchell said it would take international aid debates "out of politics", and said it was "part of the DNA of Britain" to have a generous commitment to poorer countries.
These days the politics of Christianity arouse little general interest in Britain.
Mr Hennessy is skilled at detecting great movements in the tectonic plates of politics and diplomacy, and his account of the sweep of a decade in which Britain ceased to be a great power is compelling.
Britain has much experience of class politics, and none of it has been good.
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Anyway, transferring American experience to Britain can in this aspect of politics be a dangerous business.
Obamamania, and the strange intimacy and chemistry of politics in a globalised world, may reinforce Britain's hardening yen for novelty.
It sits, of course, on the mast-head of Britain's most popular right-wing libertarian politics blog - Guido's order-order.com - showing its ability to cross political boundaries, and at the same time change meanings.
The Liberal Democrats must be a permanent, independent force in British politics - not afraid to work with others in the best interests of Britain, but confident to do so because we are confident about our unique identity and approach, and want to make that independent vision count.
Britain lacks the pocket-lining sleaze that enlivens the politics of other countries.
But he accused the Conservatives of "playing politics" and scaring people with "meaningless" statistics about Britain's energy supplies.
Some mature democracies, especially Britain and America, are seeing a new phenomenon: the rise of politics itself as a profession.
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Britain's anti-politics mood, which predates even the parliamentary expenses scandal of 2009, is so vociferous that no party in particular suffers.
The NDP is also profiting from the travails of Michael Ignatieff, the Liberal leader, who entered politics in 2006 after spending most of the three previous decades working as a journalist and academic in Britain and the United States.
He has been published by the Royal United Services Institute of Great Britain and in the Washington Times on subjects related to military modernization and international politics.
Mr Mandelson had serious enough aims in politics, principally those of making Labour electable again after its suicidal tilt to the left after 1979, and moving Britain closer to the European Union.
An obviously unrepresentative form of highly centralised government will create over time already is creating in Britain as polling evidence shows even in these days of Liberal decline a growing cynicism about politics as such.
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