By CONOR DOUGHERTY
Census Bureau data released Monday show the extent to which strong minority-voter turnout in the 2008 election helped President Barack Obama win over swing states and make inroads into Republican strongholds.
About five million more people voted for president in November than four years earlier, with minorities accounting for almost the entire increase. About two million more black and Hispanic voters and 600,000 additional Asians went to the polls.
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While the figures reflect a long-term demographic shift, they also attest to the success of the Democrats' extensive campaign to register their supporters and get them to the polls. Overall, the 64% turnout was unchanged from four years earlier.
The data also show an increase in turnout by young voters. Those between 18 and 24 had a 49% turnout rate, up from 47% in 2004 -- the only age group to see a statistically significant jump at the polls.
Strong minority support helped Mr. Obama's campaign win swing states such as Ohio and pick off Republican redoubts including Virginia, Nevada and Indiana, according to an analysis of poll and Census data by William H. Frey, a demographer at the Brookings Institution who blended the Census data on voter turnout with poll data from Voter News Service.
The data are the latest to highlight the demographic conundrum facing the Republican Party, which in 2008 lost several red states to Mr. Obama largely because it couldn't compete among minority voters. This demographic challenge isn't going away, as non-Hispanic whites are expected to account for less than 50% of the U.S. population by 2042.
To be sure, Mr. Obama's victory also relied on white voters: In 19 states including California, New York and Massachusetts, a majority of white voters cast ballots for Mr. Obama.
"Democrats are getting the growing parts of the population: Young people, minorities and states people are moving to," Mr. Frey said.
Mr. Frey cautioned that while the long-term demographic changes favor any candidate that can best harness minority voters, Mr. Obama's success in 2008 doesn't mean an easy road to victory awaits him in 2012. Whites accounted for 76% of voters in 2008, down three percentage points from 2004 but still a substantial majority. His rival, Sen. John McCain, won white voters by 12 percentage points, versus the 17 percentage-point margin enjoyed by George W. Bush in 2004. A Republican candidate who could capture a larger share of whites could neutralize the minority edge that went to Mr. Obama.
"President Obama can continue that momentum only if he continues to hold onto minorities and also hold Republicans at bay among white voters," Mr. Frey said.
Mr. Frey found minority voters made the difference in several key states: North Carolina, Florida, Virginia, Nevada, Ohio, Indiana, Maryland and New Jersey. Mr. Obama's ability to win over minorities there overcame white voters who favored John McCain.
Write to Conor Dougherty at conor.dougherty@wsj.com
