It appears that a part of the issue is due to lack of education and
naturalization among the Hispanic population. Hope this helps.
"Traditionally, voter turnout among minorities (African Americans and
Latinos in particular) has fallen behind participation by whites. It
is important to note, however, that ethnicity alone does not account
for a lack of participation. When such socioeconomic factors as
education and income are controlled for, the racial differences
between voters are nonexistent (Verba and Nie 1972; Verba, Schlozman,
Brady, and Nie 1993; Verba, Schlozman, and Brady 1995; Leighley and
Vedlitz 1999; Schlozman 2002, p. 444)"
--http://www.eagleton.rutgers.edu/News-Research/NewVoters/Ethnicity.html
"When considering the potential electoral power of Latinos,one fea-
ture of the population should immediately be considered:A substan-
tial number of Latinos are not citizens and are therefore ineligible to
vote.Of the 18 million adult Latinos who live in the United States,
slightly more than 7 million (39%)are not citizens (Casper &Bass,
1998)." --http://apr.sagepub.com/cgi/reprint/30/3/285.pdf |