The Associated Press:
Clinton led with 739 Super Tuesday delegates to Obama's 700. A total of 1,681 delegates were at stake in 22 states and American Samoa.
Overall, that gave Clinton 1,000 delegates, to 902 for Obama with 2,025 delegates required to claim the nomination in Denver at this summer's convention.
The AP tracks the delegate races by projecting the number of national convention delegates won by candidates in each presidential primary or caucus, based on state and national party rules, and by interviewing unpledged delegates to obtain their preferences.
In some states, like Iowa and Nevada, local precinct caucuses are the first stage in the allocation process. The AP uses preferences expressed in those caucuses to project the number of national convention delegates each candidate will have when they are chosen at county, congressional district or state conventions.
Clinton needed to maintain a 100 delegate advantage in order to have "done well" in the Super Tuesday primaries and she barely maintained that margin, a sign that there is still a long road ahead for both candidates before this race is decided.
Update: The latest count, this one from the Washington Times, shows the following:
Mrs. Clinton has about 1,045 delegates, including 261 superdelegates, of the 2,025 needed for the nomination, according to ongoing counts by the Associated Press and the two campaigns. Mr. Obama has about 960 delegates, including 202 superdelegates.
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