I agree that it's very hard to measure Asian voting patterns, especially in one election.
But there is a fairly extensive data set on Asian voting over the last 20 years.
The following numbers come from a Pew Research website analysis I read, in December 2012 as I recall.
I'll search for the link if you need it.
I strongly disagree that “most East Asians vote Republican.”
The most Conservative Asians are Filipino.
They vote in the 45% to 50% range for the GOP.
Vietnamese are second.
They vote in 40% to 45% range for the GOP.
I can't remember how Koreans vote, but it is definitely not a majority for the GOP.
Japanese and Chinese are hopeless.
They consistently deliver less than 30% of their vote to the GOP.
I was including southern and central Asia in my earlier comment.
Muslims vote 80%-90% for Democrats.
Shockingly, Indians are the most anti-GOP Asian group.
They consistently vote in the 90% range for Democrats.
You can thank Tricky Dick and his support of Pakistan for that.
Two, Indian-Americans mostly live in very blue or Democratic states. Bobby Jindal and Nikki Haley are very unrepresentative.
Three, Indian Americans tend to support the party in office (though I don't know how they compare to other ethnic groups on that score).
Still, it is a mystery. There are a lot of Indians in Texas. Are they more likely than other Asians there to vote for Obama?
I could bring up the stories about Obama as a devotee of Hanuman, but better we don't get into that.
Virtually all of the material on Asians has been derived from recent exit polls in a few places ~ one of them being San Francisco.
First, the definition is too broad. We know virtually 100% of the folks from the Indian subcontinent are Democrats or worse. All of them from India are from families affiliated with the Congress party anyway. The Chinese are all over the place ~ in Hawaii for many years if it weren't for the Chinese we wouldn't have had a Republican party there. The Japanese there OWN the Democrat party.
The mainland Japanese are well distributed ~ but so many of them life in California they just don't count if they get involved in Republican politics.
Filipinos are whatever the other guys aren't wherever they are. Korean retail services owners vote for Democrats on one issue ~ government paid medical care. Koreans in the professions tend to be Republicans. The problem here is almost all of them in the US are Christians who attend church regularly so you're better off looking at church related materials than ethnocentric materials when it comes to that crowd.
Greater New York has a large East Asian community. First, there are the Chinese whose families have been there for a couple of centuries or more. Then there is the entire criminal class from Shanghai ~ for a variety of reasons as the Chicoms moved in they moved out to New York.
Then there are strays of all kinds who grew up where politics was dangerous so they don't have any!
There is no East Asian racial vote like you find with Jews, blacks and Mexicans. They ALL vote for politicians who promise them some financial benefit in their present condition. That's mostly a function of class and the fact virtually all of them have some recent immigration experience in their families.
I haven't found any common social promise that would entice any of them. Their gay guys are already married to women anyway ~ a function of the East Asian custom of requiring chillun' to marry!
We have a local African immigrant community. They are delirious with joy at being somewhere they don't have to bribe government agents to get a license to open stores. I really have no idea if any of them care about politics, but I do know a number of these guys ~ their kids went to the same high-school as one of my sons.