1. A politician who represents corporate interests and wealthy individuals rather than the interests of middle and working class Americans and chooses to run as a Democrat rather than Republican either because his state or district will not elect a Republican or he has convinced the wealthy he would do a better job protecting their money than the GOP alternative. 2. A Democrat who puts the interests of corporations and wealthy individuals ahead of the progressive ideals of the Democratic Party and ahead of even the success of the party as a whole. 3. A Democrat who calls himself a moderate when in fact he is an extremist in protecting moneyed interest and is to the right of the overwhelming majority of the American people and even his own constituents.

A Republican from the 1990s, prior to the Republicans becoming even more extreme than they already were, causing conservatives to call themselves Democrats.

slang for a police officer, less controversial than calling them pigs, but holds more disdain than just calling them a cop.
"blue" from the color of their uniform, "dog" for several reasons, including their use of drug sniffing dogs and police dogs, they are expected to follow orders, they can be violent, sniffing their noses in people's business, etc. etc.