KANSAS CITY, Mo. — Top Kansas Republicans will try topass a flat income tax when lawmakers return to Topeka in January, but Democratic Gov. Laura Kelly calls the idea a “non-starter.” As Kansas sits on a budget surplus of more than $2 billion, many Republican lawmakers want to again advance a flat tax after the governor blocked the proposal this spring. House and Senate GOP leaders even spent the fall touring the state promoting the idea. But Kelly, who first won election as governor in 2018 promising to steer Kansas away from the fiscal woes of Republican Gov. Sam Brownback’s administration, …