The number of black and Hispanic registered voters has fallen sharply since 2008, posing a serious challenge to the Obama campaign in an election that could turn on the participation of minority voters.
In the 2008 election, robust turnout among black and Latino voters is credited with putting Obama over the top in key swing states, including Virginia and New Mexico.
Voter rolls typically shrink in non-presidential election years and registrations among whites fell at roughly the same rate, but this is the first time in nearly four decades that the number of registered Hispanics has dropped significantly.
That figure fell 5 percent across the country, to about 11 million, according to the Census Bureau. But in some politically important swing states, the decline among Hispanics, who are considered critical in the 2012 presidential contest, is much higher: just over 28 percent in New Mexico, for example, and about 10 percent in Florida.
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