RENTON, Wash. (AP) — Seattle Seahawks running back Chris Carson is trying his best not to get caught up in thoughts of the future. It's not easy when a regular topic of conversation is what will happen to him when his rookie contract expires after this season. Carson has developed into one of the top backs for a team that prides itself on running the ball. But the Seahawks have to answer questions about how much the team might want to invest in a back who has suffered season-ending injuries twice in three years.