Pew Report: Latino Voters and the 2014 Midterm Elections, Geography, Close Races and Views of Social Issues

From the description:

...despite a growing national presence, in many states with close Senate and gubernatorial races this year, Latinos make up a smaller share of eligible voters, according to an analysis of Census Bureau data by the Pew Research Center.1 Since 2010, the number of Hispanic eligible voters has increased by 3.9 million. Their share among eligible voters nationally is also on the rise, up from 10.1% in 2010 and 8.6% in 2006 (Lopez, 2011), reflecting the relatively faster growth of the Hispanic electorate compared with other groups.

Source: Pew Research Center

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View map of Latino electorate by state.
View map of Latino electorate by congressional district.