Clinton was projected to win in Tennessee and Alabama.

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The victories came an hour after wins in Virginia and Georgia. Sanders's only Tuesday win so far was in his home state of Vermont.

Oklahoma, Texas and Massachusetts were too close to call as polls closed at 8 p.m. EST, major news outlets reported.

Clinton is poised to have a strong night, especially in the Southern states that have more minority voters. The series of early wins will help her extend her delegate lead over Sanders.