Forget Congress, a sluggish economy and terorrism. President Bartlet has bigger headaches. Namely, Aaron Buerge. ABC's The Bachelor after nipping at Barlet's wingtips all season, finally upended NBC's The West Wing in the TV week ended Sunday. The marriage minded reality series, featuring the photogenic Buerge and his quest for an equally photogenic bride, attracted a season high 16.3 million viewers for last Wednesday's outing, landing the show in lucky 13th place.