Greg Sargent with some background on how the maneuvering to replace Harry Reid as minority (or majority) leader is likely to shake out: This debate is already underway: Two liberal groups are now floating the idea of a Warren run for the post of Democratic Senate leader. Judging by the Twitters, most political observers have already decided that the two major contenders for the post will be Chuck Schumer and Dick Durbin, with Schumer seen as the heavy favorite.