Mr. Marshall, who represents the “Big First” District in western Kansas — a sprawling seat that often propels statewide Republican victors — has made clear through his own advertising that the size of the field is of great concern. He has singled out in particular Mr. Hamilton and Dave Lindstrom, a businessman and former Kansas City Chiefs player, trying to convince Kansans that supporting those candidates would divide the vote and aid Mr. Kobach.
“Bob Hamilton + Dave Lindstrom = Kris Kobach,” read one mailer from Mr. Marshall’s campaign, the letters sketched on an image of a chalkboard. “Math can be complicated — elections shouldn’t be. A vote for Hamilton or Lindstrom is a vote for Kris Kobach.”
The winner of the primary is expected to face State Senator Barbara Bollier, a retired anesthesiologist who until recently was a Republican, and did not have a significant primary battle of her own.
“Most of the ads that have been run on the Republican side are negative and getting more negative by the moment, so there’s a lot of collateral damage that will be left on the playing field,” said former Gov. Kathleen Sebelius, a Democrat. “It’s always nice in a situation like this to have the opportunity — which Barbara, I think, is taking great advantage of — to introduce herself in a very positive way. To use this time, without a primary opponent, to make sure she’s known, gets to define herself, before Republicans come after her.”