Kansas GOP Sens. Sam Brownback and Pat Roberts both supported a measure narrowly defeated in the Senate Wednesday that would have allowed a gun owner to carry concealed weapons across state lines if he have a valid permit from his home state, even if he didn't meet the permit requirements in the other state. Brownback's spokesman said the law change was "common sense" and would have made it "easier for the 48 states with similar conceal carry laws to offer reciprocity." But former GOP Rep. Tom Davis of Virginia argued that forcing states to comply with weak permitting laws in other states "flies in the face of federalist principles" regularly espoused by Republicans."As conservatives, we usually oppose nationalizing what is best left to the states," he said. But not when it comes to guns.