Lindsey Graham had some violent words for Donald Trump Tuesday, saying, “come to South Carolina and I’ll beat his brains out.” Graham, appearing on CNN’s “At This Hour,” argued that if Donald Trump is the Republican nominee, it will be the “end of the Republican Party.” Lindsey Graham: If he becomes the nominee, we’ll get killed. Kate Bolduan: You may say it’s not sustainable, but it surely has sustained. Just look at the latest poll, this one coming out from Monmouth University. I know you saw this one. He not only has a sizable lead, we’ll throw it up there,...