British Prime Minister David Cameron said he may hold a referendum on whether the UK should remain in the EU on the day of the next general election in 2015 . . . Cameron did not clearly endorse this idea , however, and also said that an immediate plebiscite on UK membership in the European Union was not on the table . . . Cameron also pledged to initiate a renegotiation process with the EU after 2015 to reclaim certain powers from Brussels such as labor law and social issues . . . Cameron’s statement was intended to placate unease with UK membership in the EU expressed in an open letter from 100 disgruntled Conservative backbenchers calling for a referendum on whether the UK should remain in the EU . . . Vince Cable, deputy leader of the pro-European coalition Liberal Democratic party, dismissed the call for a referendum as “horribly irrelevant” . . . the Prime Minister’s tentative promise to hold a referendum after 2015 is a blatant gesture to drum up Conservative Party support but is unlikely to pacify the party’s eurosceptic wing . . . at the same time, this proposal will aggravate already strained relations in the UK governing coalition . . . Cameron’s call for renegotiating the UK’s relationship with the EU amid the unravelling economic crisis will probably be met with curious indifference by his European counterparts.