Wow! I had no idea that my column criticizing such close-the-border crusaders as CNN's Lou Dobbs, Fox News Channel's Bill O'Reilly and Harvard political scientist Samuel Huntington would trigger such emotional responses. They do have a following, indeed! In last week's column, which has since been published by The San Diego Union-Tribune, the Arizona Daily Star and several other U.S. newspapers, I disputed claims that Hispanics are "taking over" the nation. I had quoted Dobbs' April 14 on-air comment that "the invasion of illegal aliens is threatening the health of many Americans," because "highly contagious diseases are now crossing our...