So many polling diaries have popped up that this may have been diaried, but I can't see it. The Mason-Dixon poll that came out today has the race in Arizona very close.
McClatchy article on various state polls
Looking at the detailed information for Arizona (pdf) it shows something surprising: Obama is leading the Hispanic vote in this state 53% to Clinton's 37%. Clinton is leading the older vote, plus the women's vote.
I had thought that Obama had a slim chance of winning in Arizona but it does seem doable for his campaign. As an Edwards fan I am not one of the super enthusiastic Obama fans, but I'm picking him over Clinton and it does seem that my vote on Tuesday can actually mean something.