EXPLANATION: This is a bit of a brain puzzle. HIDA (hepatobiliary iminodiacetic acid) scans have been used to measure biliary function including the size and function of the gallbladder. The purpose of the gallbladder is to store bile, secreted by the liver, for digestive purposes. Of course, bile is also used metaphorically to describe a sour temperament. And that is the (somewhat convoluted) joke. Here the Trump supporter is just full of bile on their scan...Another example of my twisted sense of humor, but I am particularly proud of this one.
Firstly, congratulations.Secondly, with them there's no liver and let liver, which is why they're always so galling.