John McCain likes to paint Barack Obama as a naive follower on key national security issues. But by moving up his planned Afghanistan speech by two days to follow Obama's, and by agreeing that more U.S. troops are needed there, McCain appears to be following the Illinois Democrat on a major proposed shift for U.S. foreign policy.

Last month, Joint Chiefs chairman Adm. Michael Mullen said he needed at least three brigades shifted to Afghanistan, but that "troop...