The question is...will it be a temporary GOP jump, or will it stay?
Only good campaigning will make this permanent. I have a feeling it could be a temporary blip based on the terror plot unless the GOP really takes advantage of this boost.
Also, keep in mind it is not likely voters.
It all depends on who is more likely to be a voter. Though normally the GOP, it could be an odd election with the Dems really being more likely to be the voters, depending on who is motivated.