Campbell moves to front of 2012 free-agent quarterback class

The 2011 free-agency period, when it finally started, featured an uncharacteristically high number of veteran quarterbacks, from Matthew Hasselbeck to Tarvaris Jackson to Alex Smith to Rex Grossman to (via trades) Donovan McNabb to Kevin Kolb.  The dust finally settled on Tuesday, when the Bengals traded Carson Palmer to the Raiders. And that move means…