The Minnesota Recount Guide is an 18-page PDF detailing the procedures of the recount -- who is eligible to be present at the recount, who may handle the ballot, how to handle challenges, etc. Here's the short version: Al Franken and NOrm Coleman (but not third-party candidates like Dean Barkley) are permitted a representative at each counting table. The recount official takes each ballot, one-by-one, and sorts them into one of three piles: Coleman votes, Franken votes, and "Other" (undervotes, overvotes, third-party and write-in votes). Either representative may challenge any ballot; challenged ballots are not counted for either candidate, but are placed in a separate envelope to be reviewed later by a panel of judges. The NOrm Coleman team is taking advantage of this rule by challenging valid votes for Al Franken. This has the effect of removing those votes from the initial recount results -- so that when later a panel of judges determines that these votes are valid, Coleman can complain about "activist judges thwarting the will of the voters". The official reason given by the Coleman team for challenging these ballots is that if a voter cast votes for both John McCain and also Al Franken, the "voter intent" is unclear. (Because, presumably, everyone votes straight party.) You can see a video of the actual challenged ballots here to see this slimy vote suppression tactic.