Yesterday former Mexican foreign minister Jorge Castaneda spoke as part of the Los Angeles Public Library-associated Zocalo program. I attended (after first going to the library where I thought it would be and then rushing over to the Music Center where it actually was) and was able to ask him whether Mexico had a "Fifth Column" inside the U.S. His answer was somewhat in line with what you'd expect; feel free to skip ahead to read it. Our host for the evening was Los Angeles Times editorial page editor Andres Martinez; that paper publishes Castaneda's column and the two were quite chummy. JC...