I have to reproduce the close effect used by CBS 2 News (the same that is in this video from minutes 0:22: http://www.youtube.com/watch?v=sQ3w72UUwnk) with my logo and my text.
How can animate my text to obtain this blue glow effect?
You need to understand that the glow in your example was probably done in a 3D application, so the look you can get with AE can only approximate the same look, but you can get it close. Simply keyframe some of the parameters in the Glow effect to make what you need.
There is no set technique to achieve this specific look, so you'll have to get it through trial and error. I Use the trial and error method all the time.
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA