If Carswell wins his by-election, and the potential momentum that could give Ukip, an EU referendum will look more likely – and the renegotiation would suddenly look very different.
As the shadow business secretary’s comments blaming Gordon Brown for damaging Labour’s credibility make headlines this week, it’s worth looking closer at the party’s attitude towards their most recent PM
The decision of nine Conservative MPs elected in 2010 to stand down suggests many fear defeat - and makes it more likely.
The Prime Minister will make a statement in the Commons later today as parliament returns after recess and the coalition continues this morning negotiating how to widen anti-terror laws.
Ukip could cost Labour several seats next year.
Douglas Carswell set for landslide victory after his defection to Ukip from the Tories.
The PM declares that the "root cause" of terrorism is the "poisonous ideology of Islamist extremism".
The Conservative MP and classically trained singer defends Oxford from claims of elitism, discusses how the law should change for child exploitation cases, and reveals why she came into politics.
Kev Sherry, of Glaswegian indie outfit Attic Lights, explains why he's changed from No to Yes on the Scottish independence question.
Had the PM refused to promise a referendum, he would likely have been deposed as Conservative leader.
Ukip's Clacton candidate, who is refusing to give way to Douglas Carswell, is now considering defecting himself - to the Conservative party.
Without a strong left presence, there is no one to counter the rightward march of British politics.
Instead of asking why there isn't a feasible left-of-centre party, we should be asking why, when support for their policies is so high, only 1 per cent of voters crossed the Greens' box in May 2010.
Following the surprise news this week that Douglas Carswell MP has defected from the Conservatives to Ukip, Nigel Farage is anticipating more Tories joining his fold.
The time available to achieve European reform looks to be running out.
The race narrows again after Alex Salmond's victory over Alistair Darling.
Leading Tory eurosceptic says Carswell's decision doesn't make sense after Cameron's EU referendum pledge.
Watch the PM clash back in 2012 with the backbench MP who has today defected from his party to Ukip.
As the news emerged today that Britain remains deeply elitist, the shadow women and equalities minister discusses her own experience, and how Labour can boost social mobility.
The party's best hope of defeating the defector lies in winning tactical support from centrist voters.
The lack of social mobility is reflected in parliament, and Labour’s own claims to represent the working class have never been more dubious.
The MP for Clacton has defected from the Conservatives to Ukip.
An investigation has found that at least 1,400 children in Rotherham were sexually exploited for 16 years. Blame is flying everywhere, so how have MPs dealt with similar cases in the past?
Although politicians are focusing on childcare, British parents are still expected to pay a higher price than in much of the rest of the developed world. We need better-quality investment.
Is the increasing amount of time our MPs spend sending tweets impinging on their more traditional engagement with voters, and each other?
Farage needs to explain why he could prevent the referendum he has always wanted.
As slavery all over the world is more prolific and lucrative than ever, a new British abolitionist movement is beginning. Just like 200 years ago, however, it is encountering “dark forces” at the top.
Andrew Lomas is new to the borough of Kensington and Chelsea as a Labour councillor. Here he tells us some truths about the area and its history, as he cleans up after Notting Hill Carnival.
How women as community leaders can combat domestic abuse.