An ambassador is a diplomatic representative that attends international meetings, banquets and parties and acts as a figurehead for their country of origin.
Legislators are members of the legislative branch of government, which is responsible for making new laws and changing existing laws.
A mayor is someone who is the highest ranking municipal officer in a city or town.
A diplomat is someone who is appointed by a nation state to represent and protect that nation's interests abroad.
A senator is someone who is elected in the central legislative body of a state (usually it concerns the upper, more prominent chamber of Parliament), by voters of a region or other territorial district, and fulfills this governing mandate for a number of years, according to the law.