LENEXA, Kan. — The pastor of the largest United Methodist Church in the U.S. launched a campaign Thursday for the Democratic nomination for a U.S. Senate seat in Kansas, upending the race in a normally Republican state as the GOP’s small majority seems less secure than it was a year ago. The Rev. Adam Hamilton enters the race as a potentially formidable candidate, though it wasn’t immediately clear how many of the eight other, lesser-known Democrats who’ve announced for the Aug. 4 primary would