Lot's of anti-perspirant.
Your're goal is to make a good impression for your case, not charm the pants off of the congress people. You have no clue what these people like in fragrances, so its best to wear something innoffensive/very close to the skin. e.g Kouros is out on both counts.
Last thing you want to do is annoy somone in power who for whatever reason doesn't like your choice of fragrance.