"Many Alabamians disagreed with Heflin's choice and in retaliation popularized the line 'I'd vote for a yellow dog if he ran on the Democratic ticket!' Compared to the hapless Smith, it illustrated the lengths some Democrats will go to support their party."
So to answer your question a Yellow Dog Democrat is a die-hard party loyalist who will vote Democratic no matter what.
Here is some links that I hope can be of help to you!
Petie
Yellow
Dogs are a liberal's best friend
By BILL MAXWELL
St. Petersburg Times Staff Writer
History of
the Yellow Dog Democrat.
What are “Blue
Dog” Democrats?
Are they any relation to “Yellow Dog” Democrats?
C-Span
R.B.
Mystic, CT
