An african american vs. hispanic riff has been long-founded, just as you see the racism riff in areas of Alabama, Kentucky, ect. Obama is not as good a candidate for Hispanics as McCain is.
Mike, I will freely admit that John McCain has more pull in the Hispanic community than any other person the Republicans could've nominated this cycle. But do you think that he could overcome the image that GOP immigration hardliners have branded on the entire Republican Party over the last four years? I think that McCain won't match Bush's (quite good for a Republican) 2004 numbers among Hispanics.
Kind of a shame that one of the few issues I agree with both McCain
and George W. Bush on is one where they disagree with practically all Congressional Republicans.