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: ONTARIO 
Clue: The Ambassador Bridge, world's largest int'l suspension bridge, links Windsor, Ontario & this city
detroit, michigan

Category: "R"ITERS 
Clue: This author of the hitchhiking novel "Even Cowgirls Get the Blues" once hitchhiked across the U.S.
tom robbins

Category: HERE'S WALDO 
Clue: This tough-guy actor's last film role was as Police Commissioner Waldo in 1981's "Ragtime"

cagney