Gewehr98, THANK you.
To everyone else, the official beer of St. Patricks day is, to me, and should be GUINNESS, from the St. James Gate brewery in Ireland.
Green-colored rice-and-corn weak, gassy lager is an American abomination, and I have no idea how it came about.
Have a Guinness with your corned-beef-and-cabbage, or, if you don't like stouts, a Harp lager or Smithwicks (pronounce "smitticks") ale.
Beannachtaà na Féile Pádraig!