Ukip could prove to be of merely short-term electoral advantage to Ed Miliband; Labour may be in power after 2015, but its principles will not.
Ukip could cost Labour several seats next year.
Douglas Carswell set for landslide victory after his defection to Ukip from the Tories.
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.
Leading Tory eurosceptic says Carswell's decision doesn't make sense after Cameron's EU referendum pledge.
The party's best hope of defeating the defector lies in winning tactical support from centrist voters.
The MP for Clacton has defected from the Conservatives to Ukip.
Farage needs to explain why he could prevent the referendum he has always wanted.
There is certainly space in British politics for a party beyond the edge of Labour, but a left-wing alternative has yet to emerge.