An interesting analysis of the alerts and their effect on the electorate:
CLOCKWORK ORANGE
TVNL LOOKS AT THE FEAR FACTOR
“…the only thing we have to fear is fear itself—nameless, unreasoning, unjustified terror…"
On four separate occasions during 2003, Americans were notified by their government that the color of the day had changed. Only this wasn’t summer camp, and no one was playing games. On each of these days, the nation was being warned that our lives were being threatened more seriously than the day before. The codified threat alert had changed from Yellow to Orange. There was nothing we could do. There was nowhere we could go. It was only a change of color, but it did the trick: Americans everywhere were being introduced to the color of fear! .....
http://www.tvnewslies.org/html/clockwork_orange_.html