With more than 99 percent of the vote counted, the one-time American Idol runner-up and Crisco each earned about 40 percent, while licensed professional counselor Toni Morris seemed a lock for third place.
The Democrats are battling to unseat two-term Republican Rep. Renee Ellmers in November's election.
"I am very confident that we are going to be victorious," Aiken told supporters.
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