MOUNT HOLLY, North Carolina (Reuters) - President Barack Obama, under Republican attack for high gas prices that could harm his re-election bid, urged Americans on Wednesday to have faith in alternative fuels and accused rivals of not telling the truth about the rising cost of energy. For the second time in less than a week, Obama railed against Republican calls for a return to $2 a gallon gasoline and what he dismissed as "phony" quick fixes to the nation's energy challenge. ...