Why are Japanese-Americans overwhelmingly Democrats?

[TDAS04]

Japanese-Americans are well integrated into diverse communities, especially on the West Coast, so they're pretty used to cosmopolitanism.  This makes them quite progressive not just economically, but on gay rights and other social issues.  

Asian Americans are becoming more and more Democratic very fast.  While many older Asians are socially conservative in some ways, living as non-whites in diverse communities especially makes the younger generation accepting of differences.  Adding to that the fact that Asians value education and are concentrated in such liberal states as California and Hawaii mean that Republican prospects of performing well among Asians appear bleak.

Going back specifically to Japanese-Americans, they have been in the US longer than almost all other Asian subgroups.  They're also pretty secular, which may be a reason why they're more liberal than, say, Korean-Americans--many of whom are evangelical.