This is the first time I have played the Budapest Gambit in a USCF rated game. More study is needed of the basic variations. Also, my tactical analysis is not sufficient for this level of competition.
Lesson learned: Surprisingly, Shredder11 preferred my 6...Ngxe5 at depth 15. This move was not found in my database search. One should not rely solely on the output of a chess engine in lieu of chess theory.