I am not sure what we mean when talk about Asians. The traditional Asians, seem to be more GOP. Remember, the first Asian to run for President was Hiram Fong.
I believe, right or wrong, Asians have a problem with the foreign policy position in the GOP. There is this female engineer with whom I worked had thought highly of Ron Paul.
Since "asians" of any kind are such a small part of the population it would have been quite easy for a skewing to have taken place simply because of the choice of the polling places (I gather there were only 20 or so).
So, take one polling place in Honolulu in Senator Inoue's neighborhood ~ that'd give you 100% "asian" responses.
Or, there's a town in New Jersey which will yield up mostly Pakistani immigrants ~ 100% for Obama.
This particular poll result repesents only exit polling that was looking to find out early who was winning ~ not particularly who was voting for who.