http://en.wikipedia.org/wiki/Yellow_dog_Democrat

"I am a Democrat from inheritance, from prejudice and principle, if the principle suits me. But I have passed the yaller dog degree."
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http://www.yellowdogdemocrat.com/variations.htm
Yeller Dawg
The Yeller Dawg is the oldest of the American Democrat Dog breed. Yeller Dawgs are vigorous, keen Democrats with hardy constitutions and absolutely no interest in any other party or viewpoints that sway from the traditional Democratic platform.