Very nice. Follows the exponential insanity curve quite nicely, with weapons going from common to non-sensical. Links are generally pretty funny too. The only thing I would recommend is reordering the taser to come before the marshmellows.
It's a pretty strange idea but it sort of makes sense, in a round-about kind of way. The conclusion is tied to the premise and it's almost convincing. Anyway, the point of the whole concept is clearly to allow for the funnies in the middle, and it does that quite successfully. It would probably be improved if the reasoning for attacking Obama was a bit stronger/more coherent.
Prose and formatting:
Effective and consistent, nothing I can really fault here. The write-in-the-style-of-a-collaborator thing works well throughout.
Not really very effective. I don't think loads of images are necessary, one will do; it's the caption that makes this one boring. The same image with a better caption could be awesome. The other possibility is an Obama covered with water balloons and marshmellows with a stock Obama quote.
Leaves a pleasant after-taste in my brain.
I hope this helps. A few tweaks and it'll be there!