That sets up a race between Holley and Republican Mark Robinson, essentially guaranteeing that North Carolina will elect its first black lieutenant governor.
Holley got just under 27 percent of the vote in the March 3 Democratic primary, short of the 30 percent threshold needed to automatically avoid a runoff.
State Sen. Terry Van Duyn, D-Buncombe, got about 20 percent of the vote in a field of six Democratic candidates but decided Tuesday not to seek a runoff.
Holley said she spoke with Van Duyn Tuesday evening.
"She was an honorable person to get to know on the campaign trail," Holley said, "a good woman, and I know it was not an easy decision for her to make, and I'm truly grateful."
North Carolina Democratic Party Chairman Wayne Goodwin said in a statement that Holley, "has been a fierce advocate for our public schools and has a proven record of working across the aisle to get things done."
Holley is serving her fourth term in the state House.
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