Cameron says won't seek third term in power

Prime Minister David Cameron on Monday ruled out seeking a third term in office if he won a second mandate in a tightly fought national election on May 7, saying it would then be time for a new leader of his right-leaning Conservatives. Cameron, whose party is neck-and-neck in opinion polls with the opposition Labour Party, also said he would like to serve a full five-year second term from 2015-2020 if re-elected, scotching persistent speculation that he would stand down after a possible Europea