I knew Barack Obama was tech-savvy [1], but I didn't know it extended to gaming! Obama's campaign has purchased ad space inside 18 video games [2], including Madden '09 and Grand Theft Auto.

He is, not surprisingly, the first ever presidential nominee to run ads inside games, and without being partisan, I have to say that I'm kind of impressed. The ads will be run on billboards and signage (which is the kind of advertisement [3] you guys said you didn't mind as much), and will encourage people to vote and to register to vote.
Very noble, but I'm envisioning a pixilated Barack Obama cracking down on Nico and his cohorts, personally!
Source [4]