Here are the relevant excerpts (I think this is behind their subscription wall, so I should at this point encourage you to subscribe yourself, and since BP is for my money the single best baseball site out there, except perhaps BaseballAmerica.com, you should just do it now.)
Adam Dunn (6.9): Although they already have plenty of outfielders, the Nationals seem the most likely destination for the big slugger, particularly with GM Jim Bowden's love of ex-Reds.Perrotto also has this about Odalis Perez:
Orlando Hudson (6.0): The O-Dog has received zero offers, and the Nationals are biding their time and waiting to sign the Gold Glove winner to a one-year deal with a low base salary that would be loaded with performance bonuses.
Odalis Perez (4.0): The Nationals need starting pitching as much as any club in the major leagues, but they have no interest in re-signing the left-hander. Neither, it appears, does anyone else.