Only three independent groups have been active in North Carolina congressional races this year. Two of them are involved in the 8th District Republican primary.
The two independent groups have spent more than $118,000 on behalf of Mooresville dentist Scott Keadle.
On Friday the American Dental Association reported spending $11,000 on a phone survey for Keadle.
The conservative Club for Growth has spent more than $107,000 on his behalf, much of it on TV buys and direct mail.
The independent spending is a boost to Keadle. A report filed this week showed he's loaned himself $250,000. He's among five Republicans running for the seat held by Democratic Rep. Larry Kissell.
The biggest independent group operating in North Carolina has been a super PAC called the American Foundations Committee. It's spent $366,715 on behalf of former U.S. Attorney George Holding in his 13th District race against Wake County Commissioner Paul Coble.
The News & Observer reports that the super PAC is funded mainly by members of the Holding family.