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: TV & MOVIE ACTORS 
Clue: John Mahoney of "Frasier" played one of the guys who sold aluminum siding in this Barry Levinson film
tin men

Category: SIMILES 
Clue: The expression this "as a judge" dates back to around 1700
sober

Category: THE CIVIL WAR 
Clue: Gen. Buckner unconditionally surrendered Fort Donelson to this Union general

grant