War On Terror: Homeland Security needs to do more than heighten aviation security in response to the cargo bomb plot from al-Qaida in Yemen. It should elevate the national terror threat level. Despite what the president called a "credible threat" to the U.S. — along with a dramatic spike in "terrorist chatter" and international travel among terrorist suspects with U.S. passports — the National Threat Advisory is still stuck at yellow, or elevated. It's time to raise the code to orange, or high alert. White House security aide John Brennan says there are no plans to lift it. "There is...