Why October 27? Because a terror warning leads to an average increase in the president's approval rating of 2.75% and the increase lasts for about a week — possibly two weeks at the outside.
The study is published in the Sept. 30 issue of Current Research in Social Psychology , a peer-reviewed online journal, at http://www.uiowa.edu/%7Egrpproc/crisp/crisp10_1.pdf .
When the federal government issues a terrorist warning, presidential approval ratings jump, a Cornell University sociologist finds. Interestingly, terrorist warnings also boost support for the president on issues that are largely irrelevant to terrorism, such as his handling of the economy.
...."Results showed that terror warnings increased presidential approval ratings consistently," says [researcher Robb] Willer. "They also increased support for Bush's handling of the economy. The findings, however, were inconclusive as to how long this halo effect lasts."