What about that weird square thing under Bush’s jacket…
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FROM A COMMENT at Kevin Drum’s site:
The real Bush choked to death on a pretzel a while back. The Bush we see on the TV is a robot, much like the Disney Animatronics stuff. This is the first result of a secret neoconservative project to replace all powerful public figures with robots, which explains why ‘Bush’ can’t stay on a bicycle or a Segway, or talk in coherent sentences - neocons are inherently incompetent. The Bulge is really the robot Bush’s motor-driven ambulatory systems control pack, and also contain s a small bomb which can be detonated in case ‘Bush’ is outed as a robot.
Okay, maybe not.
Hee.

Wait a minute. What the hell is that thing?

It could be body armor with ceramic inserts - he is the president, after all.
Or a colostomy bag for his head