A Texas gun instructor who made headlines with an ad in which he said Obama supporters and Muslims are not welcome in his class is kind of, sort of backtracking off his statements. Crockett Keller's radio ad has gone viral. "If you are a socialist liberal and/or voted for the current campaigner in chief, please do not take this class," Keller said in the ad. "You've already proved that you cannot make a knowledgeable and prudent decision as required under the law. Also, if you are a non-Christian Arab or Muslim, I will not teach you this class." The Texas...