(Agencies)
Updated: 2008-03-10 10:23

CHICAGO -- Barack Obama would not be leading the Democratic presidential race without the enthusiasm and high turnout of black voters.

They spearheaded his comeback win in South Carolina, where Obama trounced Hillary Rodham Clinton and John Edwards with the backing of four out of every five black voters. They provided his margin of victory in many other states, and will play a key role in Tuesday's primary in Mississippi, where Clinton is the underdog.

Democratic presidential hopeful Sen. Barack Obama D-Ill. smiles as he walks around on stage during a campaign rally Friday March 7, 2008 in Laramie, Wyo. [Agencies]

But Obama's campaign saw the limits of black support in last week's losses in Ohio and Texas, which kept Clinton's campaign alive. And the role black voters will play in the next big contest, Pennsylvania's April 22 primary, is unclear.

Moreover, some analysts think it's possible Obama's heavy black support is nudging some working-class white Democrats into Clinton's camp. If true, it could be an important factor in a contest that remains remarkably tight after a year of campaigning.

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Obama, the son of a white mother from Kansas and a black father from Kenya, won slightly more white votes than Clinton in Wisconsin, Virginia and a few other states last month, helping him to a string of wins and the overall lead in delegates to the party's national convention.

But Clinton won nearly two out of every three white votes in Ohio, and 56 percent of those in Texas, where she also ran well among Latinos. Strategists are pondering the results, wondering if Pennsylvania's demographic similarities to Ohio will deliver another important win to Clinton in six weeks.

Ronald Walters, a University of Maryland political scientist who tracks racial trends and is writing a book on Obama, thinks Obama's strong support from blacks made it easier for some whites in Ohio and Texas to vote for Clinton.

"There's some of that," Walters said in an interview. He pointed to exit polls from Ohio, where 62 percent of all whites lack college degrees and many are anxious about their jobs in a weak economy.

"This is a racially sensitive group," he said, referring specifically to whites who earn less than $50,000 a year and did not attend college.

"They are the quintessential Reagan Democrats," he said. "They feel they've been left" and their resentment can have social and racial overtones.

Ohio exit polls support Walters' view. Eighteen percent of white Ohio voters said race was an important factor in their decision, and of that group, three in four voted for Clinton.

In general elections, which pit Democrats against Republicans, the racial sensitivity of white voters has been pronounced and well-documented for decades. It's a chief cause of the realignment of the South, where blacks remained intensely loyal to the Democratic Party as whites moved to the GOP by the millions.

In the intraparty world of Democratic primaries, however, racial divisions are much less prevalent, and hard to measure. Many white Democrats, especially in the South, tend to be liberal, racially tolerant and usually happy to join blacks in opposing Republicans.

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