OMAHA, Neb. (AP) — Republican leaders across the U.S. are encouraging chapters of the conservative political group Turning Point USA in all public high schools in the wake last year’s assassination of co-founder Charlie Kirk , an effort they describe as countering the oppression of conservative voices in education. The group’s endorsement by Republican governors — at least eight so far — has stirred debate about free speech in America’s schools, with critics arguing many of the same