By James Oliphant and Nathan Layne PETERBOROUGH/MANCHESTER, New Hampshire (Reuters) -Former South Carolina Governor Nikki Haley accused Republican rival Donald Trump of being “obsessed” with dictators and too old to lead on Saturday in a final stretch of campaigning in New Hampshire ahead of Tuesday’s presidential nominating contest. The former U.S. president ramped up his verbal attacks and targeted Haley’s Indian heritage as the former ambassador to the United Nations sought to blunt Trump’s momentum following his victory last Monday in the Iowa caucuses. New Hampshire boasts a more moderate…