2006 estimates from the US Census:
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Black % of population: 12.37
Hispanic % of population: 14.78
Asian/Pacific Islander %: 4.52
Remember, Hispanics have a fertility rate at least two times that of all other ethnic groups, so many of the Hispanic count are in fact younger voters.
It is estimated that, "Nearly 67 million people of Hispanic origin (who may be of any race) would be added to the nation’s population between 2000 and 2050. ...an increase of 188 percent. Their share of the nation’s population would nearly double, from 12.6 percent to 24.4 percent." In other words, they are the fastest growing, and by in large, a youthful segment of the population. Note, that in just 6 years, the Hispanic percentage of the population rose from 12.6% to 14.8%. The black proportion of the population has not changed that much in over 100 years.
Although the stats are interesting, there is also a strange habit many have of talking about "Hispanic" as if it were one nationality. There are dozens of countries involved, many mulatto that are in fact part African-American, so "Hispanic" origin does not really say much about a specific political identity much less ethnic identity. There are similarities for sure, many are Catholic, most have a language heritage from Spanish, Portugese, or some native Indian tongue, but I would be hesitant to lump them all together as they come from dozens of countries.
Also , many Hispanics have been here 3 generations or more since the time when Mexico owned California and much of the southwest, but those native Hispanics are also well integrated into American culture and have a lower fertility rate than the recent immigrants. Very often those native Hispanics may not even speak Spanish themselves since their families have been here so long. I have even heard of them vocally resenting the more recent arrivals, possibly setting up a political divide between them.
Recent immigrants and naturalized citizens have quite different concerns than the settled native Hispanics. Remember, they are the ones with the high birth rates, and younger overall population age. Many know of someone struggling with an immigration concern, and that may be a predominant issue with them. Also, with recent immigrants, many likely relate to the same issues that any poorer group would have politically. I would be reluctant to generalize and say race has no bearing on the vote, but the stereotyped high school rivalries of black vs. latino gangs are a bit overblown, imo, and probably won't matter as much as economic and immigration issues in the general Hispanic population.
Given that the two evangelical candidates in the GOP race have dropped out (or are otherwise insignificant), that one possible connection with conservative religious values really is not a factor at all, especially as the religious Hispanics are largely Catholic anyway. The native American Hispanics may go more conservative perhaps, but I would expect the vast majority of Hispanics to be more at home with the Labor-loving rhetoric of the Democratic party than with anything the GOP has to say.