what makes dogs blue?
"And the oversimplistic answer to this oversimplistic question has often been that Blue Dogs tend to represent marginal districts they could lose by toeing the party line."
my thought is that many of them come from conservative districts and probably swapped parties to get elected. or they could be gop operatives who switched parties to make inroads into the dem party- which seems to be working. which means- they are toeing the party line. just not the party we elected them to.