*[[Kay Hagan]] (North Carolina)<br>All potential Republican challengers lead Hagan in polling; Heather Grant, Thom Tillis, Greg Brannon, Mark Harris, and Bill Flynn.
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*[[Kay Hagan]] (North Carolina)<br>All potential Republican challengers lead Hagan in polling; Thom Tillis(Endorsed by Karl Rove), [[Dr. Greg Brannon]] (Endorsed by Rand Paul), Heather Grant, Mark Harris, and Bill Flynn.
*[[Tom Harkin]] (Iowa)[1]<br> Democrat Rep. Bruce Bailey has declared.
*[[Tom Harkin]] (Iowa)[1]<br> Democrat Rep. Bruce Bailey has declared.