By ACACIA CORONADO and SARA BURNETT UVALDE, Texas (AP) — Surrounded by fellow Republicans on a high school stage, Gov. Greg Abbott was wrapping up his opening remarks about the killing of school children and teachers in Uvalde, Texas, when Beto O'Rourke strode forward from his seat in the audience. “Gov. Abbott, I have something to say," the Democrat challenging Abbott for governor this fall said Wednesday,