The media for one thing. All the major media outlets in KS are extremely left-wing, and Brownback is a constant target. Plus, in the election of 2012, conservative Republicans knocked out RINO GOP in the House and Senate. Brownback endorsed those conservatives. All these RINOs have now endorsed the Democrat and are working to unseat Brownback.
It is amazing that Brownback’s tax cuts have been turned into a negative, but they have.