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While I agree with you that obamasbrainisdead is the worst kind of troll as well as a clearly unintelligent and misinformed person -- your proposed solution amounts to censorship and would establish a bad precedent. It would also deprive us of a chance to see and analyze the various pathologies of the opposition -- thereby limiting our capacity to develop tactics and arguments to counter them.
There are three workable solutions that don't involve muzzling that dog.
1. Microsoft was just awarded a patent for the "page up" and "page down" buttons. Try using them.
2. Engage this creature in debate, not in the hope that you will change its mind (not possible as it clearly doesn't have an operating healthy one) but to inform other readers as to the idiocy of its positions.
3. Advocate for a labeling system such as slashdot.org uses that allow users to "label" such commentators as trolls and further, allowing us to set our preferences to render such individuals invisible. It's a good system and it works. It's also long overdue here at Salon, as their current commenting system is hideously outdated and primitive.