2A person who is inclined to support any candidate affiliated with the Democratic Party, regardless of the candidate's personal qualities or political qualifications.
he is a self-proclaimed yellow dog Democrat
Definition of yellow dog in US English:
yellow dog
noun
North American informal
1A contemptible or cowardly person or thing.
〈非正式〉可鄙的人(或东西)
Example sentencesExamples
Given the hysteria in March over the ‘outing’ of Sarah Champion the yellow dogs seem strangely muted.
2A person who is inclined to support any candidate affiliated with the Democratic Party, regardless of the candidate's personal qualities or political qualifications.