We know for a fact that the hardcore candidate partisans are coordinating with each other to uprate troll comments and downrate non-troll comments, depending on whether said comments are favorable or unfavorable to their candidate. This pack behavior has become pretty obvious, and we are in the process of identifying the worst offenders.
Those partisans will find (or have already found) their ratings abilities yanked, regardless of which candidate they support. That punishment may or may not be rescinded after the primaries. It'll depend in large part on how pissed off I remain at the ratings abusers.