I could see the Redskins covering here at +3.5, but not winning though. The Denver defense is too good to allow that against this Skins anemic offense. The Denver defense kept the Broncos within one score in both games against the Ravens and Steelers going into the 4th quarter. Both of those teams offense's and Quarterback's are 10x better than what the Skins have to offer.
What could keep the Skins in this game, is Orton. Orton might have some confidence issues, after playing terribly two games in a row. Trying to regain that confidence back might be even harder for him, since it's on the road. I could see Orton committing some turnovers or taking a few sacks here, that would prevent Denver from scoring enough to blow out the Skins. McDaniels has also chosen to replace Denver's Nine year veteran right guard Dan Neil, with some ex-patriot dude name Russ Hochstein. I have no clue who Hochstein is, but Haynesworth might have a field day with this guy.
The Skins played the Eagles at home competitively, and I can see it happening here too! So what you got here is a pretty decent Redskins defense vs a Broncos offense still in disarray and trying to get that cohesion back. To me this adds up to a field goal win Denver's way, because Campbell is worst than Orton and Clinton Portis is out.
I also think that the Under at 37 is the more preferable play here. He'll, teasing the Redskin +9.5 and Under at 43 is should be a lock, but that might be a correlated teaser though.