Any Vikings on the trade block?

The NFL's trading deadline is Tuesday, and general managers will surely be scrambling to upgrade their roster for a playoff push or slashing their roster of a high-priced veteran or disappointing draft pick. As their 6-0 record shows, the Vikings have plenty of talent, and they also have depth at several key positions. The question is whether the Vikings -- with a Super Bowl caliber team -- get an offer attractive enough to shed a player/ players who may have to step into the lineup later in the season. For instance, what if a team makes an offer for Tarvaris Jackson or Sage Rosenfels? At what point the Vikings pull the trigger on the deal, especially with starter Brett Favre a short-term project, at best. At this point, based on their strong start, the Vikings likely wouldn't have a chance to land the premium quarterbacks expected to be available in the next NFL Draft. Does it really make sense, then, to trade Jackson for a fourth-round pick? The Vikings also have ...