Maybe it is sampling error, or just anecdotal, but the worst prosecutorial abuses that I am aware of (and that may be the key) are by Democrat DAs. The conventional wisdom would have it that law and order right wingers would be the culprits. Does anyone have a theory based on more than thin air?
It could be that there are simply more Democrat DAs than Republican DAs. The press is overwhelmingly Democrat and are often loathe to go after members of their own party nearly as ferociously as they would investigate members of the opposition party.