In the entire weekend discussion of the President Bush’s “guest worker” proposal for (mostly) Mexicans in the United States, there was a yawning omission. Doesn’t anybody remember Tom Lehrer, George Murphy, or the braceros? As the master himself was wont to say, “Here’s a song about that.” Shortly after the 1964 election in which California elected a singer/actor, George Murphy, as its new Senator, Tom Lehrer presented his musical “salute to your new junior senator” at the legendary Hungry I in San Francisco. Some of what Lehrer said and sang, so long ago, requires updating. In his introduction to the...