SANDY, Utah (Reuters) - Veteran U.S. Senator Orrin Hatch of Utah will face a Republican primary fight after delegates to a party convention on Saturday denied him the nomination, forcing him into an election with a Tea Party-backed challenger who finished second. Hatch, 78, won the day over nine challengers, but narrowly fell short of reaching the 60 percent of the vote needed in a pairing against his number two challenger to win the nomination outright and avoid the primary. Heavily Republican Utah last elected a Democrat to the U.S. ...