If lately you have been asking yourself, "Just who is Barack Obama?" or, for that matter, "Who is John McCain?", you have an excellent opportunity to find out. Tonight, Frontline is airing their quadrennial, in-depth look at the major party presidential candidates in their special The Choice 2008. You can watch it in its entirety (two hours) below. Also, don't forget that the final debate is tomorrow night.

You can also download the show for free from the iTunes Store.

Update: Replaced preview videos with full episode.