Ted Cruz, a Republican freshman in the Senate who has been front and center in his party’s effort to squash Chuck Hagel’s nomination as secretary of defense, has a problem. He’s an ornery, swaggering piece of work. Just six weeks since his arrival on Capitol Hill, he’s already known for his naysaying, his nit-picking and his itch to upbraid lawmakers who are vastly senior to him, who have sacrificed more than he has and who deserve a measure of respect, or at least an iota of courtesy. Courtesy isn’t Cruz’s métier. Grandstanding and browbeating are.