A dark-haired comedic actress, Ana Gasteyer has used her slender, non-exotic appearance and relatively privileged background to her advantage, standing out as one of the better impersonators on "Saturday Night Live" with takes on over-composed popular icons including Martha Stewart and First Lady Hillary Rodham Clinton. This remarkably energetic performer had little vanity about her work, and arguably did her best when looking the most foolish. From her early credits, playing housekeeper Alice in "The Real Live Brady Bunch" national tour to a mid-90s stint with the Groundlings, the Washington,