I think everyone needs to be on heightened alert because there is a high probablility of some sort of operation taking place. Just look how the terrorists did the train bombing in Spain in order to try and sway the election their way. And it worked!
According to the news reports, there has been more chatter in the intellegence community about possible action being taken. The hardest part is that we have so many vulnerablilties that it is damn near impossible to guess where they will strike.