In a democracy built on the premise that justice should be blind, a CBS News investigation has illuminated a shadow marketplace where presidential clemency — once a solemn constitutional power — appears to have become a commodity available to those with sufficient funds and connections. Lobbyists operating outside the traditional Justice Department review process have been captured on hidden camera promising wealthy felons access to presidential favor for hundreds of thousands of dollars, prompting senior Democrats to vow accountability while the administration insists its review process remai