EUREKA, Kan.— Orella Hosack, wearing a “Choose Life” shirt and sitting at the edge of the room at the Copper Kettle restaurant, liked what she was hearing from a tea party candidate challenging the state’s longtime GOP senator. But she had also heard a potentially alarming rumor — that Milton Wolf, the radiologist trying to unseat Sen. Pat Roberts in Tuesday’s primary, is related to President Obama — and she wanted him to address it. “If you’ve been paying attention to the campaign, you know there are a lot of vicious personal attacks,” Wolf replied. “I think you deserve to...