In Washington, D.C.’s convention center they danced the horah, sang Hebrew songs, and waved American and Israeli flags. Charlie Daniels played Hatikvah on his fiddle. It wasn’t a bar mitzvah, or a gathering of the pro-Israel group AIPAC. It was the fifth annual summit of an even larger pro-Israel organization, the nation’s largest: Christians United for Israel, better known as CUFI.