LAS VEGAS, Nevada—Maybe I should have called this article “Yalla Brandon at the Kosher Cattle Call” but too many readers would have no idea what I was talking about. “Yalla Brandon,” as former White House Press Secretary Ari Fleischer explained during a press gaggle at the Republican Jewish Coalition’s annual leadership conference in Las Vegas (the former White House press secretary is on the board of the organization), meant “Let’s go, Brandon” in Hebrew. We had all been hearing a lot of “Let’s go Brandon’s,” mostly in English, during the conference speeches from a group of around one hundred Southern California college students (UCLA, Cal State Long Beach and so forth) bussed in from Los Angeles for the event and seated near the back at tables labeled “Young Adults.” Their jubilant cries were soon taken up by the other six hundred or more older attendees during a barn burner speech …