Incumbent

"The final count is in!" cried the lungs. "Our leader for the next election cycle of the body is... the Brain!"

"Four more years! Four more years!" chanted the kidneys, as Brain and his vice-president, Duodenum, took the platform for a speech.

"It's not really fair. He's got like five or six different personalities in there, at least," the bowels grumbled. "And you do not want to meet Lizard Brain."

"Next time," said Stomach darkly. "They can't keep me out forever. I used to own this body." Teeth gnashed encouragingly beside him, although chances were they'd never see his reign.