"I think Roberts was vulnerable in a three-way race," said Nathan Gonzales, deputy editor of the Rothenberg Political Report. "Not having a Democratic nominee at all helps Orman."
U.S. Senate candidate Chad Taylor staying on ballot in Kansas after trying to drop out →
"I think Roberts is going to get outside help," Mr. Gonzales said. "In general, can Republicans turn this into a generic Democrat versus a generic Republican race? Because that's the kind of race Roberts can win in Kansas."