How many starting RBs are worse than Portis?

[hail_2_da_skins]

I've said it before and I repeat. Clinton Portis has Shaun Alexander disease. He runs untils he anticipates contact and then falls down or run out of bounds. The 78 yard run is a prime example. Practically every back in the league would have scored on that play. When the play first started, Portis did his normal move, running up the back of his blockers, not cutting to daylight. Unfortunately the defense provided no resistance, so he had to run up field. He had one defender to beat and a blocker in front. How come he can't set up the block and beat one defender or cut back and out run the defender? Portis runs like an old back...Shaun Alexander disease.