Beginning another term, leader promises new constitution
                                
                                
                                    (Newser) -
                                    Turkey's longtime leader, Recep Tayyip Erdogan, took the oath of office on Saturday, ushering in his third presidential term that followed three stints as prime minister. Erdogan, 69, won a new five-year term in a runoff presidential race last week that could stretch his 20-year rule in the key...