Each campaign is working hard to lure the other's supporters. So far, Obama seems to have outdone Clinton, making progress among whites and women since this year's earlier contests, according to polls of people leaving voting booths in this week's primaries.
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In the end Tuesday, 53 percent of both whites and females supported Clinton, along with a 63 percent of Hispanics, which helped tip the balance for her in states like California, New York and New Jersey.
Yet Obama and Clinton roughly split the white male vote, a group he'd had trouble wooing in contests before former Sen. John Edwards left the presidential race last week. Obama also won more than four in 10 female votes, including more than a third of white females -- better than he has usually done this year.
Clinton could not claim she had seriously eroded any of Obama's constituencies. He held onto eight in 10 black voters, including black women -- a familiar pattern this year and a stark change from last year's polls, which showed the two candidates usually splitting the black vote.
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The exit poll figures came from interviews with voters by Edison Media Research and Mitofsky International conducted for The Associated Press and television networks. The samples came from 431 precincts across 16 states with primaries.
Included were interviews with 17,491 Democratic primary voters, for whom the margin of sampling error was plus or minus 1 percentage point. Also included was a poll conducted by telephone with 1,005 Democrats in Arizona, California and Tennessee to determine the views of early and absentee voters.
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