MONROVIA (Reuters) - Liberia went to the polls on Tuesday for a presidential election that voters hope will mark the country’s first democratic transfer of power in over seven decades, despite it being tarnished by allegations of fraud. Former world footballer of the year George Weah is squaring up against vice president Joseph Boakai, with both men promising a break with a heritage of poverty and corruption in a country where most citizens have no reliable electricity or clean drinking water.