hi tkc,
i think environment eclipses skin colour.
i'd guess latino hicks and farmers will vote much like white hicks and farmers. and i daresay the reason so many latinos vote dem is because they preponderantly live in cities. other factors also include gop hostility, which exacerbates the environmental factors.
i also think fellow feeling informs the black vote for obama, but it would be high regardless of his colour. and again, the vast majority of black people live in high density regions.
i don't necessarily accept the thesis that because younger people tend to vote democratic that therefore as they age, a greater proportion of the population will vote dem. one can just as easily argue that people tend to lean towards republican ideas as they age and so the views of this generation will turn red as they retire. not sure what is true.