The Kansas House rejected an attempt to override Democratic Gov. Laura Kelly’s veto of a $1.6 billion tax cut centered on a flat income tax rate, a stunning failure for Republican leaders who spent weeks counting votes. The 81-42 vote, which fell 3 votes short of the two-thirds majority needed to advance the override, sends GOP lawmakers back to square one in their standoff with Kelly over taxes. Heading into Tuesday’s vote, supporters of the override had expected to have sufficient votes to override Kelly but four Republican lawmakers changed their votes killing the tax policy before it reach…