When Mike Huckabee announced he wasn't running for the GOP nomination, many other possible candidates issued statements of support. But not Mitt Romney.
The Atlantic gives a short explanation of why the two men don't like each other.
Huckabee's disdain for the robotically good-looking Republican runs all the way back to the 2008 Iowa caucuses, where he surged past Romney after a bitter campaign. But it wasn't just primary posturing that forged the rift between the pair. Really, you couldn't pick two more aesthetically different Republicans: Mitt the tall, good-looking technocrat who touted business-acumen and deempahsized his Mormonism. And Huck, the formerly fat, fast-food loving, guitar-playing, evangelical Arkansas governor with such a bitingly fast one-liner that he could render Mitt to "plastic-smile status" instantly.
After reading that, one almost wishes Huckabee would run, just so we could watch the inevitable sniping back and forth between the two men.