Here we go again. War in the Middle East. Instability and violence in Iraq. A confident, bellicose Iran continuing to pursue the capability for nuclear weapons. A terrorist plot intended to cause "mass murder on an unimaginable scale" by blowing up as many as 10 planes over the Atlantic Ocean. Though elections -- particularly midterms -- are traditionally driven by local concerns and personalities, with just over 80 days to go before voters step behind the curtain and make a choice, the issue of national security is again looming large, as it did in 2002 and 2004. The domestic political...