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In late February, Mark Harris announced he will not run in the new election for North Carolina's Ninth Congressional District.
Harris said he was endorsing Union County Commissioner Stony Rushing as a candidate for his seat.
Blackwelder said in his statement he believed this is the best decision and will "hopefully prevent a run-off."
North Carolina officials set Sept. 10 as the date for the new election.
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"These people need and deserve representation", Blackwelder continued.
In his post, Blackwelder said he would be refunding contributions from supporters.
RELATED: North Carolina officials set date for new election in state's 9th Congressional District following ballot tampering evidence