While the more established parties, such as the Front National and the Sweden Democrats, look set to enjoy the next year, others are likely to remain firmly on the fringe.
Promising an in/out vote would shift the debate back onto Tory territory and allow Cameron to claim that Miliband is dancing to his tune.
The threat by Nissan to withdraw from Britain if the UK leaves the EU shows how the Tories' euroscepticism pulls against their emphasis on stability.
Such a clear U-turn would cement a corrosive narrative that could prove far more damaging to his prospects of becoming Prime Minister – that of weakness.
The EU doesn't even make it into the top ten of voters' concerns. Miliband's speech should focus on housing, wages and jobs.
Many opposition MPs are persuaded by the case for making a virtue of necessity: resolve the issue and expose Tory divisions.
The six Labour MPs who voted in favour of Tory MP James Wharton's EU referendum bill.
Shadow minister Ian Austin's dramatic call for an in/out referendum next year shows how party unity is fraying.
Withdrawal from the European arrest warrant would turn the UK into a haven for foreign criminals.
The idea of tabling an amendment to the Tory bill demanding a referendum before the next election is gaining currency in Labour ranks.