(Xinhua) -- British Prime Minister Tony Blair pledged on Tuesday afternoon to lead the Labor Party to a fourth-term election victory. "I will help build a unified party with a strong platform, for the only legacy that has ever mattered to me is a fourth term election victory that will allow us to keep changing Britain for the better," he said in his last speech as leader to the Labor Party conference here in Manchester. Blair thanked the Labor party for giving him the "extraordinary privilege of leading you these past 12 years" in a farewell speech punctuated by loud applause and marked by standing ovations. Reflecting on past achievements and how politics had changed over the years, Blair said "We defied conventional political wisdom and thereby changed it."