Well, a good rule of Old Media thumb is that if it were Republicans doing something shady, a big fat "R" always follows the name for all the world to see. When a political affiliation is absent from a do-badder, it's almost a sure thing that do-badder deserves a "D" after his or her name...
Remember back when Gary Condit had his problems and the media went out of its way to avoid saying he was a Democrat? There was some infobabe, probably Katie Couric but I'm not 100% sure, who actually started referring to Condit as a "conservative" congressman from California!
With that in mind, I always assume that if an MSM doesn't mention the party affiliation of a wrongdoer in a political story, it's a safe bet they are a Rat.