The story

A string of recent victories and endorsements from key party insiders have Democratic presidential hopefuls Barack Obama and Hillary Clinton running neck-and-neck in the increasingly important battle for delegates.

Clinton holds a narrow delegate lead over Obama, 1,157 to 1,145, down from her lead of more than 100 delegates a month ago, according to CNN's estimate.

A candidate must secure the support of 2,025 delegates to clinch the Democratic presidential nomination. Read full article »

CNN's Adam Levy and Megan Zingarelli contributed to this report.

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