Marshall, who represents the state's 1st Congressional District, defeated controversial former Secretary of State Kris Kobach and business owner Bob Hamilton in a competitive primary to determine the GOP nominee in the race to succeed Roberts.
Marshall, a veteran of the US Army Reserves and an OB/GYN by training, is a staunch conservative but still a far more mainstream Republican when compared to Kobach. His primary run was endorsed by outgoing Sen. Pat Roberts, National Right to Life, and the US Chamber of Commerce.
Bollier, also a physician, has served in the Kansas state legislature since 2011 and in the state senate since 2017, where she has advocated for greater healthcare access and education funding. A former Republican, she positioned herself as a common-sense, pragmatic centrist with experience reaching across the aisle.
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