As bad as that Monkey hammer was, I don't think he's scum. Scum hammering their partner without even giving them a chance to claim on D1 is ridiculous. I think it's just awful town play. On to who Starbuck's scumbuddy/buddies might be:
Claramata/Tarballs: As we know, Claramata only made one post and didn't say anything much at all. Tarballs makes a few comments towards Starbuck about the self-voting situation but none of them call her scummy. The strongest thing he says against her is that she's 'pushing a bit too hard'.
Spinach: disagrees a couple of times with Starbuck over self-voting but never calls her scummy, just saying that Starbuck did nothing to stimulate discussion. Starbuck's random vote is on Spinach but there's no interaction on her part aside from that.
ODDin and DNW went after Starbuck quite aggressively and I'm ruling out Monkey for the reason indicated above. The only other possible candidate is Hernz, who would only make sense as Starbuck's partner if he wound her up by self-voting to the point that she decided to put him back at L-1. Given the incredibly principled stance Starbuck took against self-voting, I'm not ruling this out. Her partner self-voting could also explain her outrage and the PM sent to myk. However, Hernz does go on the attack more strongly against her later on: in post 136, for example, he actively focuses on Starbuck and tries to push the discussion back to her.
In conclusion:
Let's hear from you. Who's scum with Starbuck?