Mississippi GOP primary race too close to call

Jackson, Mississippi (CNN) - The heated race between longtime Sen. Thad Cochran and conservative challenger Chris McDaniel was too close to call late Tuesday night. McDaniel held a razor-thin margin over Cochran of less than one percentage point.

The Mississippi race is a high-profile tea party vs. mainstream showdown. For tea party supporters, it's perhaps their best chance to claim victory after facing a string of defeats this year.

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