Sporting News 140: Ranking NFL's 140 greatest players of all time

The NFL has had so many outstanding players over its 106-year history. That makes coming up with 140 best Hall of Famers and active legends and then ranking them a near-impossible task.Sporting News has been around for the league's entire existence with a chance to cover most of the all-time greats, in turn with many gracing SN's past magazine covers, some multiple times.From quarterback to kicker, these players have defined NFL history, earning much of the top individual accolades and ultimate team glory. Here's the break down of SN's selections by position:Quarterbacks: 14Running backs: 18Wide receivers: 14Tight ends: 8Offensive tackles: 19Guards: 7Centers: 6Edge rushers: 14Defensive tackles: 11Linebackers: 19Cornerbacks: 12Safeties: 10Kicker: 1Starting with the most clutch kicker of all