does portis' status change any of this? does a team vinny described that might be interested in peterson decide to cast their lot with portis instead?
Portis is a Redskin now and will be a Redskin next year unless someone really offers up a huge deal for him, likely one bigger than what it would take to move up for Peterson. I don't see Portis going anywhere.
That said, someone could move up to grab Adrian Peterson, but if you look at the teams immediately behind us in the draft I don't know how many of them would really be looking for a top-end RB either or willing to pay the price to get him:
Miami at #9 has Ronnie Brown earning big money and playing pretty well, and will have Ricky Williams back next year if they decide to keep him.
Atlanta is at #10, and although Warrick Dunn is starting to get old, they still have Vick and Jerious Norwood so Dunn doesn't have to run the ball too much and I don't think they'd really move up for Peterson, especially at the cost it would take to move up 3-4 spots. At #10 they can grab Reggie Nelson or LaRon Landry and help out their defense a lot.
At #11 the 49ers just had Frank Gore put up a huge season and isn't getting paid a ton of money yet, so they aren't going to spend a bunch of picks to move up for another RB.
At #12 you have Buffalo, if they decide that Willis McGahee is done there then they could possibly look to move him and trade up to grab Peterson, or they could stay where they're at and grab Marshawn Lynch, but all of this is assuming that they give up on McGahee.
Then at #13 you have St. Louis (Steven Jackson), at #14 you have Carolina (Deshaun Foster and DeAngelo Williams), at #15 you have Pittsburgh (Willie Parker), and finally at #16 you have Green Bay, who are definitely going to be looking for a RB, but to move up from #16 to #7 or higher they'd likely have to give up at least a future 1st round pick, which seems like a steep price for them, especially since Lynch could fall to #16 or at least end up a lot closer to their current pick than Peterson will. The way it looks, if Peterson gets past Cleveland then I think he's ours.