For a decade the landscape of British politics has barely altered. Tony Blair has dominated from Downing Street and his party has held power comfortably not just in Westminster but in Edinburgh and Cardiff too.
This landscape is about to change. Today 39 million people will have the chance to cast a vote in the biggest electoral test since the last general election. A week from today the Prime Minister looks set to announce his resignation.
For the first time in 50 years Scotland go to the polls with Labour running second. If Alex Salmond's Nationalists win it will send shock waves through the political system and could trigger years of tension between a Salmond led Scotland and a Brown led Britain.
If Labour polls badly in Wales they might struggle to form a government even with the support of another party.
The English local elections are first and foremost about choosing who runs our town and city halls BUT they too will be studied to see how far David Cameron has climbed his electoral everest.
If Labour sees off the challenges in Scotland, Wales and the electoral battlegrounds of England they and most importantly Gordon Brown may start to contemplate the possibility of another decade in power.
The old cliche has it that a week is a long time in politics. The next week won't just be long. It will help define the new shape of politics for years to come.