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.

Category: IMPOSSIBLE 
Clue: (AUDIO Daily Double):  Impossible as it may sound, '60s sitcom star heard here:  "To dream, the impossible dream, to fight the unbeatable foe...."
jim nabors

Category: GOVERNMENT & POLITICS 
Clue: He's the current president of the Senate
al gore

Category: SOUTH OF THE U.S. 
Clue: It's the mountain range you have to be in to conquer Mount Aconcagua

the andes