instruction:
You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
question:
Category: PRESIDENTIAL ELECTIONS 
Clue: He's the last person to receive a state's electoral votes while not running as a Democrat or as a Republican
answer:
george wallace


question:
Category: U.S. PRESIDENTS 
Clue: 1 of the 3 U.S. Presidents to run on a third-party ticket after having already served as president
answer:
teddy roosevelt, martin van buren & millard fillmore


question:
Category: SCIENTIFIC INVENTIONS 
Clue: In 1608 its inventor offered it exclusively to the Dutch government for military use
answer:

telescope