OPEC's job has just become tougher with Trump win

By Maha El Dahan , Rania El Gamal and Dmitry Zhdannikov DUBAI/LONDON (Reuters) - OPEC's job of trying to prop up oil prices has just got much harder. With Donald Trump winning the U.S. presidential election, the 14-country oil-producing cartel may have to battle a sourer outlook for the global economy and weaker demand for crude. It also faces the prospect of increased U.S. oil output - a major bugbear for the Organization of the Petroleum Exporting Countries - given Trump's pledge to open all f