Facing a must win situation against an opponent in preseason form, D.C. United suffered a disappointing 3-2 loss to F.C. Atlante last night. United put forth a solid effort, but was exposed by Atlante F.C.’s efficient counter attack. Atlante’s victory relegated United’s SuperLiga 2008 hopes to a mere prayer. The SuperLiga pits four MLS teams against four Mexican clubs. The teams are selected based on their performances in domestic league and tournament play during the…