The penalty was called during stoppage time in the match between conference leaders.
Frankie Hejduk scored the Crew's other goal in the first half.
Cam Weaver got the Houston goal in the second half.
Columbus (11-4-9) holds a three-point lead over second-place Chicago in the Eastern Conference.
Houston (11-7-7) leads the Western Conference.
Copyright 2009 by United Press International.
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