Aside from politics, I was quite impressed by the typeface of that Sarkozy campaign...I guess it's custom type, but if anyone can relieve my itch about that beautiful typeface?

Thought the same thing: really nice font.

Yes you are correct, it's a customised Kontrapunkt according to the threads posted at Myfonts/Typophile.

http://www.myfonts.com/WhatTheFont/forum/viewthread.php?threadid=76723