I don't care about boring posters whom I ignore so I submit the following names:
Democrats - Lief or BRTD, all-time notorious partisan hacks
Republicans - vosem, even if he didn't vote R for president, the amount of motivated reasoning he pushes in favor of the R side as of late is truly stunning. He's Baghdad Bob of Republicans on the forum, both in terms of policy and polling. Astonishing!
The main metric that I am using here is based on the extent to which the poster 'spins' everything and generally just wants D/R politician to crush the other side in a colorful way. These guys are simply incredible.
Badge of honor! And very accurate!
I honestly think the 2006 midterms influenced the way I view politics to this day. Crushing the Republicans then was just so much fun, and created such a high!