Debate: Best running back in the NFL

Posted by ESPN.com's Mike Sando

The best running back in the NFL right now? I went with Clinton Portis based on his production as a runner and the way he attacks the game in other areas. The assessment takes into account only the first six weeks of the season (Portis leads the NFL in rushing). There are other backs I'd draft ahead of him if starting an imaginary team, including Frank Gore. Thoughts?