Secret Service Call Signs

With all the candidates running for President in 2008, the Secret Service will have to come up with new radio call signs for each protectee. This article from the Washington post mentions that candidate Barack Obama has been dubbed "Renegade",

http://www.washingtonpost.com/wp-dyn/content/article/2007/06/16/AR2007061601079.html

This article mentions that President Bush (43) has a call sign of "Tumbler", which it was when he was Governor of Texas. But I do recall that after he was elected to President, his call sign was changed to "Trailblazer", with the First Lady known as "Tempo".

The July Fed Files column will feature a focus on Secret Service radio frequencies.